Sometimes, you feel that you've been duffed by your friends. They are just using you for their own purposes. They may ne nice in front of you but different behind you. It is hurt for most but if you can just let it go then it is fine. And if you just leave them and then you are only about to make the problem gettinh bigger. So the first is that you need to do is just don't keep the distance from them. Refuse them openly and tell the reasonable reasons why you would not do that.
The second is that listening to your friends reasons. But remember tat do not make those reasons push you down below that make you just a real duff. Jut be yourself feel like the way you are. Do not even become that is not you. It is just labeling just create you own label. Time by time you need to stay away from your friends that make you just duff. Be your style and be smart.
People would forever respect you when you are smart and have a good attitudes. Never mind any other opinion about you. They are just labeling you but they would never can. You label yourself so that they would see you. It means you need to be yourself. and be smart. Appearance is not important, the most important is your skill and your brain. :) Stay positive