Friends or are they Foe?

I really feel like its to little to late because I'm over half way done with school. This whole year I've been having issue's with a bunch of these people who clam to be my friend. I've noticed that a lot of times that these girls never really included me in any social gathering. Example they wouldn't ever ask me if I was going to prom or invite me to come sit with them during free time in cl, when they are all mangling. When I am around them, I feel like they just talk amongst themselves and pretend I'm not there. When the focus is finally on me and I make any comment about anything, they always never agree and say I'm stupid or that I'm really weird. Like one asked me how to sharpen this weird shape pencil and I told her to use a knife unless you want to buy a special sharpener. She said that I was weird for saying that :? Another chick that's a 'friend' always yell at me when like I say something wrong. For example today I told her that I noticed she wasn't there yesterday and asked like if the reason was that she over slept (she's well known to sleep a lot). The chick yells at me and says "NO I WAS SICK, OMG." It was a little embarring because it was in front of a cute guy that I like. So I try to avoid talking to her because it always makes me feel embarred. Though I can't avoid them completely because the only one friend that I do consider being real, hangs around them. I have cles and see them in the hallways all the time so its really hard to avoid them. I really want to find new friends who accept me and don't consider me beneath them. I really don't know how so any suggestion?