At some point in our lives we've all felt like that. I thing changing schools wouldn't be a good idea especially around this time when you're doing your gcse year and it's really important for you and your future. On the brighter side, you still have people you can call your friends and that's always a plus. I'm currently in year 13 and I felt that way too but eventually I started to learn to ignore what people said about me or come up with something to say to them. Even when I was with friends I felt there was some sort of barrier between us but I realised that I was using them as well, even tho we didn't get on too well I was only sticking close to them so I wasn't alone. This may sound stupid but I think for now you should focus on the positives, focus on school and when you're in college you'll definitely find people you get along with, just like me.