A few boys just don't seem to like me? why?

So, I don't even know this one guy and he said he hates me because I am obsessed with zac efron, which isn't true...I just said I like him. Anyway he treats me like crap a lot. Another story is with this other guy. It was in history and this kid walked by and ate something gross off the gound. I said eeeewwww pretty loud and my whole cl heard it. The kid was like shutup really rudely. Then another guy from across the room and was like" what is she complaining about now" I took that offensively. MY friend at lunch said he was just joking, but I knew he wasn't. I think I am very pretty. I am a little overweight but I look at inner beauty, which I am very nice to anybody. People just tend to treat me like crap. I am kind of a pushover, but when I am not, It always starts drama. What did I do to these people?