How can I make more friends?

Im 12, 7th grade, using my moms account though ( dnt worry ) Anyways.. ill walk into homeroom in the morning and Everyone looks at me and some even go '' eww! Its Brittany '' And they mean it. They whisper about me and stuff... I always get in fights and stuff with my friends... Im not very hard to get along with! People dont like me for some reason! I just need some help getting through 7th grade. Thanks guys! :)