Loneliness in school? help please!!!!?

i kinda hate going to school especially in my cl, because most people there are not very friendly to me (idk why, probably because im new in my cl), and some people hate me for what ive done in the past and i just wanna have more friends but everybody seem to ignore me because they have their own cliques, i wanna join them but sometimes im clueless thinking about what should i talk about. and im sick of thinking about this almost all the time. i just wanna have friends. thats all. some people said im choosy when it comes to friends but i dont think so because i talk to everyone in school, its just that im not very close to them. and they dont know who i really am. im a really fun person, try to hangout with me at shopping mall, theyll fall in love with me. and i didnt know why i became quiet and shy in school. exam is coming up and this thing is still bothering me. help please!