And keep telling yourself "I can do this" "I will do this" you can't lose okay? Don't lose to the sad feeling, think of it as a blog of goo that's trying to eat you up but you have to fight it in order to survive.
Oh you could also do this. Take deep breaths and calmly say 'I can do this' then let it all out and scream. Scream into a pillow, scream I'm the middle of the road (when you're at a place no one knows you). You know how in Korean dramas there's always that one scene where the girl/guy goes to some kind of secluded mountain area and screams out his/her anger and yells out his frustration, then cries in despair and then drives back home and sleeps peacefully at night and wakes up in a happy mood? Yea, I suggest you do that.
Sorry if it sounds like I'm on crack or something but I feel like these things work
I mean it doesn't hurt to try
Also see your school councilor to see if they can help. And if they're as useless as the ones I've heard of then go to a psychiatrist and of that person is also useless in making you feel less sad then grab a friend, and tell her/him that you need a day to just let it out.
But please I think you're overwhelmed with feelings because you feel stress from so many directions with all of the things in your life you just need to calm down and sort everything out. Take deep breaths and take as much time as you need but the faster the better. Once you have a less stressful schedule you'll feel better
And are you lacking sleep? You work 6 hours a day how much sleep do you get cuz you have college and homework
Get
Yo
Sleep
Girl

The best way for you not to stay sad is to do something you love, I know how difficult your schedule is but I feel that you've been constantly stressed out with everything going on in your life. On the weekend take a break, take a day off from work and do something you like. You like writing right? It doesn't have to be public but you could write something to get your mind off of things, whenever I feel sad or homesick I always write everything out. Everything feels so much nicer afterwards. If you're feeling like nothing can make you happy remember that SJ is always there for you, remember the moments from exploring the human body with super junior? That was hilarious !!
Surround yourself with an optimistic atmosphere because if you're depressed and your put in a room by yourself then you're going to seep further into depression.
Feeling homesick is the worst feeling in my opinion, so why not call home?
You could also try something new like cooking or something.
I think you need to make some time in your schedule and do something you like or try something new.
And when you get a chance, write everything out, all of those sad feelings, everything and everyone that's making you feel sad and making you cry, write everything out and make sure none of it is left out. If you just feel sad for no reason then you should freehand some sketches and convert your feelings into an image. It's good that you wrote to us about this, at least you're not lying to yourself about this.

I don't want to rob you of anything, but I'd like to suggest that you lessen your working hours and properly settle in school first. Get into the flow of things, you know? The stress from work and school compounds, and school in itself can already be very stressful. (That was an advice for us when we were freshmen.) But also, why not try to have days of fun just hanging around with your good friends from before uni? I wasn't able to establish as tight relationships with my college friends, so just catching up with my high school friends was like going back to the past and prepping for the future in a fun way. Make sure that these are the people you're most comfortable with, the people who would never judge you no matter what crazy thing you do. And I suggest that whatever extra-curricular activities you go into, do them because you have fun and love doing them. (If you don't enjoy them, they'll just drag you down more.) This way, even if you're still a little nostalgic about home, you won't be too sad because where you are distracts you enough from spiraling into loneliness.^^ Have fun! Will be praying for you.^^

I'm sorry I don't have any good advice
But hold on! You can do it! I know you will! It can take some time to get used to the new environment, it happens to everyone. Most people I know took one year to adapt when they moved to a completely new place. Make part goals, and make sure to survive them. Like that test, making kimchi, or making that party or whatever. Stick with friends and have fun. I'd you haven't made any friends at your new place, get a"social" hobby. Then you hang out with pwiplw with same interests as you!
Well, here I said I didn't have any good advice! Uhm, I don't know if they're any good, though

I understand you, sometimes things are so new, different, overwhelming….
Well I think that it helps, but I suggest that you start a new hobby?
You're already drawing, so you can draw to relax, but you can also try a new hobby! :D Like, pottery, a sport, music, dancing?
Try to distract yourself from your problems…? Focus on the good things happening to you, not the bad things!
Fighting!! I hope everything will be better for you! <3

Hey there! I stumbled upon this, and instead of telling you how to live your life, I'm just here to tell you to hold on!! Give it time :) It will get better, just don't stop fighting! Bad feelings come and go, and they say you can't ree a rainbow without a little rain right? I hope you feel better soon, have a wonderful day ♥

Talk to your parents, have some chit chats with them (You can talk about something random).
And well, maybe listen to the music?? Sometimes music can erase our bad emotion... I don't know if that will work on you, but that works on me whenever I am feeling lonely

Honestly, right now I'm feeling the same way. My life is taking an abrupt turn and I'm not sure if that turn is safe. I feel homesick even when I'm at home. I feel lonely even when there are so many people around me. Every night, I cry myself to sleep. I know what it feels like. I also know that there are a pot of people that do love you, and you can lean on them. Talk to the ones who will care. Tell them everything you're feeling, and u promise everything will get better. It may not be soon, but happiness will return. Heck, you could even talk to a stranger. Let it out, and continue to release these sad feelings. I am not one to speak my words, but rather write them. I write everything I feel and think, and at the end of the day, I read it. I read what I have felt throughout the day, and then I cry because I am reminded of what I am feeling and it comes back. But then I write again and again. Sometimes I get angry at myself, and the anger turns to just a memory, like those sad feelings. So talk, write, just kind of explode. In fact, you don't even need to do it in words. If you play an instrument, let it out while playing music. If you do a sport or some physical activity, and get involved in it. Draw. That helps a lot, too. Lose yourself within the drawing. By the time you have finished, you should feel better. These sessions don't have to be long (line are usually ten to fifteen minutes long), but I'm sure if you do one of these things at least once a day, you'll feel better. I really hope this can help you. Good luck!

Listen to music :) And write everything in a journal. Talk to your parents. Connect with your friends. You're a lovely person, stop feeling sad :)