What am i meant to do with me... help me?

i am a 15 year old girl with a mind of her own i all ways say whats on my mind i am a happy and sweet girl but i have to say i can be a right bi@$h when i really wont to. i have friend but not a lot i'm not in with the populer people at my school. i have so many people at my school who hate me but they have never meet or even tryed to talk to me and when some one who says they hate me and takes the time to talk to me that say some thing like this " wow your a really nice girl and people are all ways saying your wired and to stay away from you" and i don't get it why do people say that for i don't get it i'm not ugly but i'm not the prettyst girl i'ver i'm not fat i am very fit and healthy and thin but not to tine just right. i have never had a boy friend . i am a very much like a tom boy but i can be a girly girl when i wont to be :( i just don't get why people hate me so much :( i try to be nice and i am but people can never talk to me :( why?