Chapter 1: Hello, I read your story. Everyone experiences problems at a point in their lives. I know, this advice is too mainstream but as cliche as it sounds, it's the truth. Are you still crying right now? If you are, you can just keep on crying. Do not prohibit yourself from this capability. Then when you're done crying (or when you're tired of crying), you can take a rest. I know you are tired right now. You also stated how clueless you are but I hope you remember that there will always be a solution for every problem.
Your family is a mess. I don't have to sugarcoat it. But who's family isn't a mess? Yet on a better perspective, I think your parents (and your brother) loves you a lot. It's their paternal instinct to hide the dirty laundry because they know that it is for your sake. You might question their agenda now, but trust me, they just wanted the best for you.
It might be painful knowing that they're throwing you in the sidelines, but let's just let them be for a while. There's this popular saying that goes, "you cannot fight fire without fire." Make it your mission to become the ice for this problem. Help them cool down. Allow your brother's friends to comfort him. You can also comfort your parents. Be their light and hero, because right now, I think that's what they need the most.
Lastly, do not let your family go into crumbles. Protect them at all cost. I pray for the best in you. Stay strong, fighting!