What should I do about my friends?

So basically I met this kid a year and a half ago and we started hanging out with him because I had no friends. So it turns out that all he did with his friends was drink and smoke. So of course I start drinking and smoking but the only reason is because they are the only people who reach out to me and if it wasn't for them Id have no friends. Now its been a year and im not the drinking type or the smoker type but if I dont participate they wont hang out and I rather do that than to have absolutely no friends and be a loner all again. Im taking antidepressants and when i get high i get the most emberassing and unpleasnt reactions and im tired of people looking at me all weird because its so obvious that im nothing like them. So basically I have nothing in commen with them and would rather not hang out with them but i dont have anyone else to hang out with. What should I do i really which I could meet someone like me but all the kids ive ever known are either drinkers and smokers or too religious. HELP.