My life is literally over now! I just failed a midterm worth 15% of my total mark
That sounds bad, but not life ending. What do you plan on doing about it?
I try to forget it by listening to relaxing music, being with friends and watching movies, escape from reality...
I'd suggest that rather than escaping from it by entertaining yourself, you acknowledge this mistake.  Use it as an opportunity to better yourself so you don't screw up on any more important tests.
It doesn't matter, I cant do shit about it, I'm a failure, I'm feeling really shitty right now.
Don't you want to pass the class? You can't sit around moping about one grade. There's still 85% of the grade left to get, so I suggest you start studying the class material and fix this.