Why are people so interested in talking behind my back?

[Luck Of Fire]

Yesterday my friend told me that people are talking sh-t and really nasty things behind my back, mainly for my
1) Gummy smile [I smile a lot and is always "high"]
2) Being ugly
3) Being "noisy" in class. [I like to ask and answer teacher's questions]
4) Once I got misunderstood by the media and caused a controversy, and as a result some of the "school patriots" hate me.
5) My "personality" [Nobody gave me an explanation for that.]

She told that there are more sh-t and I am really famous in school and a lot ofed that I think my school is not good people hate me. I am not even a mean person who calls people ugly/fat/shitty and a majority people hate me for the above points?...

From then, I begin thinking about who is talking behind my back- teachers, relatives, members of social organisation I am part of....I am getting really paranoid about this. I don't expect everyone to like me but they shouldn't be so mean to me.
I don't think I have an attitude problem.

I am doing rather well socially. I have three close friends [two friends for more than 3 years, another one for more than 7 years]. Two boys have confessed to me [one like me for my straight hair and another I am not so sure, but I think he've dropped hints that he like my smile].
She tried to stand up for me when one the people I barely know approached me in the shopping mall and asked me why is my friend being "friends" with me. I am really starting to feel the hate.