it sounds like you just need to take a chill pill. every one has their own uniquiness and in highschool everyone else is just as insecure and worried as you are. they are trying to figure out who they want to be and they dont want anyone to judge them. so in a sense you have the same fears as everyone else. i think that you should go back to your boxing class, because when you get older and your fears are mostly gone you are going to look back and say man i wish i would have done this or that. and imagine the friends you are missing out on right now by not interacting with anyone. you need to try to now because soon you will be graduated and you'll have to get a job and you will definitely have to interact with people. also when you start into something like the boxing class focus on the task at hand not the people around you because once you get into the exercising that will take your mind off of your surroundings. something else that might help is(this is blunt but true) just remember this, ive learned since graduating that even though you feel like everything is about you and everyone is focusing all there attention on you, they are not, frankly people could care less. not that they dont care about you but they are not nit picking everything little thing that you are doing.