I have been in a very similar situation. My only hope of blocking out the outside was immersing myself in music, tv shows, games or even studying. Be wary, because that can become destructive very easily.
Do you know what you want to study during college? Is it something that you really like, or smth meh? Or if you haven't decided yet, what subjects do you like most/would use in your daily life? Anyways, you should find something to work on, anything at all, whether it is a hobby or towards your future. Immerse yourself in that and get better at it. Before you know it, you won't care about the outside troubles because you'll be too busy making your own life better.