Understand that your body is a temple meaning it's your body, you need to take care of it. You shouldn't have to expose yourself to feel beautiful or (sexy). Respect your body it was a gift given to you. Exposing yourself won't make you look more beautiful or (sexy). The only thing it's doing is making you look like you have no respect for yourself. The scars and flaws you have are yours and only yours. In todays world showing your body is everywhere. On magazines, tv, and ect. I feel we have role models to look up too but the internet never shows the positive things those ladies do. Or shall I say they don't pay attention. Your body is a work of art and you should appreciate it. Once something is on the internet, no matter if you delete it. You don't know if someone saved it or screen shot it. Don't do something that you will regret. If you see friends exposing themeselves help them out. If they don't want to listen then at least you tried, you can't help someone that doesn't want to be helped.
Most ladies do it because they want boys to like them or want someone to tell them their body is (sexy). I'm telling you now, that is won't last forever. Boys will do stupid stuff, you think they like you but really they can be talking about you to their friends or ect. Don't embarrass yourself, keep your body to yourself. You will gain your confidence one day just have patience, encourage yourself and ask God to help you through it.