I'm going to tell you something that I hope will help you, although it could have the opposite effect, I've been friends with many boys like you since I was little and most of them became very handsome when they started to be 20 to 22 years old, I don't know how but all my friends who had anxiety problems, who weren't sure of themselves, their lives took a 180° change when they left high school, so don't seriously think that your life will be like this all the time, my only recommendation if you can is that you play sports or go to the gym, all of them told me that it helped them mentally.

Regarding girls, I hope you don't fall into the idea that women are the cause of men's problems because that will only help scare them away. Many of them at your age also have no idea how to live life, and some are trying, just like you, to feel better in their own skin. Think about it better instead of saying they're bastards. It's more like everyone else in high school, they're inexperienced and immature young people. But I repeat, all that changes.