Are you being funny and silly at inapprpriate times? Sometimes what is meant to be funny and silly can cme across as insulting and annoying. Talk to someone in your class and ask if maybe you have been coming off all wrong.
Why does my class have a general dislike for me? One guy made fun of my weight (I'm not even that overweight) another asked me: Is there anyone in the class who likes you? And yet I'm the funniest, silliest, most likable person in the class?
School has cliques when you get out of high school thats all over. Be yourself
I mean if you have to TRY to get people to like you, and they end up liking you. They don't really like you for you.
But your last question may give a hint as to why there are people who feel that way towards you.
Maybe you are not as funny as you think you are - might need to tone it down some.