This whole blog is just me talking about my crush so just skip if you don't want to waste you time~

So i need your advice guys. Basically, i have a huge crush on a friend and i honestly dont know what to do. So here's the thing. I met this friend 4 or 5 years ago when i was a senior in highschool and he was a freshman. Now i'm in my last year in college and he's in his second. He's a year younger than me but in college years he's 3 years younger. Since i met him, we'd rarely really talk. We shared the same interests so we'd usually talk alot but then we'd stop for weeks and then months. Now years later we started talking again but now regularly. Looks wise he's totally my type. His personality is also very much my type. But here comes the problem. As I said , he's younger than me. I'm graduating this year but he still has a long way to go before graduating.and after that, he has to go to serve in the army for two more years. So that's five years being away. He also lives in another city so i've never actually met him. So i'm kinda confused as to what to do. Everyday I'm always looking forwards to talking to him but at the same time i'm scared that i might be bothering him. I'm always excited whenever i get a new message from him and when we just talk about nonesense i cant contain my feelings. I like him so much! But he literally only sees me as a like-minded friend. idk what to do. Any advice? You can send a private msg if you'd like :)