We come to the internet to places like Wizchan looking for like-minded people so we have somebody to talk to and we rely on video games, anime, movies, music and hobbies to ease the pain. Some also use chemicals (never tried it myself so I can't tell you if that works).
>Even if it sounds really pathetic it fucking hurts I wish I could stop thinking about other people
It's not pathetic at all, it's called being human. If you are not in the autistic spectrum or are not some complete psychopath is going to hurt. Most people are social by nature. Try to avoid the mental damage as much as you can by avoiding the people that causes it (almost all of them) and treat yourself with the things that make you happy (videogames for example).
Try stuff like stoicism, it may help a little to change your perspective. Try to improve a little every day to feel good about yourself and ignore the assholes. Do things like developing a skill, working out, etc.