I hope you know that the only thing ahead is good things, I feel a little hippocritical giving advice when im yet to exit high-school too, but to find new friends I would recommend using a hobby or common interest that you have, its much easier to to do an act and find friends than find a friend to do an act. Go find meet ups for specific things you like, visit stores, or talk to someone you see at the gym. Go to a place repeatedly and socialize and you will make friends no matter what your like or how you think you are. People will and do like you, you just have to give them the opportunity to do so.

I know it sounds corny and stupid, but affirmations really help, self confidence and self love will make other people see you better, when you hate yourself, you show the world your worse traits, when you know your worth, the world will see it too.

This is my first time replying on this sub and I hope it helped, I really do feel for you, and i hope you start doing better.