Have faith!  I didn't go to a fancy HS like you, but there were still plenty of fakes and toxic ppl.  When you get to Uni just go to as many club events as you can.  We had chess, poker, MMA, lock picking, anime, basically if you can name it we probably had one.  9 times outta 10 they are really welcoming and just want cool ppl to chill with and talk about dorky stuff with.  It might take a few tries to find a club you like but once you do you'll have a lot of really great friendships just waiting to happen.  Best of luck to you!