Dear Liam Lemon~
Welcome here to the Forum. I've had a careful read of your post, and am not sure I understand everything however I do understand that there is difficulties getting on with some of those in your class.
Having only been there a year or so makes it harder. No long term established relationships, plus when groups already exist one can be seen as an outsider and have problems being accepted and joining in.
I went to a lot of different schools as my parents moved around a fair bit and your words do bring back similar memories for me. I found groups were not my thing, I'd end up having one or two real friends I enjoyed being with and relied upon, and that was basically it. Then of course I'd move on and have to start again.
In your situation the ones who are your real friends are worth a fair bit of effort to keep and give support. If this means ignoring a group or individuals as a result, well, not end of world. Friendship is a two way thing, they need to support you too of course.
I wonder why you are rude when you first meet someone. You say yourself it is not your true feelings. I guess it is something that may give others a bad impression of you and not go on to become friends. Why do you think you do that?
If you start out rude then it is very hard to turn around and be nice. if you start out nice on the other hand you can always turn nasty if it is deserved.
That last thing you said "I can get along with people unless they’re up them selfs or think they’re more cool then someone else" I'd have to say I'm the same.