I know the problem, it happened to me a few years ago... Trust me, they will eventually grow out of it. I know right now that's not much help to you, but the only thing you can do is basically ignore them or make them see you don't care. And remember DON'T change your personality, or your values, just to fit in with them as best as you can. There's so much more to someone than the way they look, but unfortunately not everybody can see that. Why would you want to 'fit in' with all these superficial people that can't see further than the end of their own noses? I know that's not what you want to hear right now, but it's the truth. Find other friends, people who truly appreciate you for who you are, and how you are as a person. Join a sports club, or an art/music club, or something like that to meet other people who are interested in the same things you are. Chances are, you'll make good friends there. I know right now your life may feel like a living hell but trust me, one day you will be happy you got over those people. Don't give up and remember, if they don't like you that's their problem. Not yours.
best of luck, and if you ever need to talk to someone, i'm here
Best of luck!

Catt x

PS. If you're really worried about your acne and being skinny, remember to eat healthy foods (hamburguers and pizzas are not the solution) and exercise. eventually your muscles will be in shape and you will seem more athletic and not just 'skinny'. and there's many treatments for treating acne, but remember a lot of people go through this and n most cases it will past. it may take a while. but it won't last forever!

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The only real voyage of discovery consists not in seeking new landscapes, but in having new EYES.