TEENs: my friend is very insecure about herself and very sensitive..help.?

Your friend needs to not worry about it, it's almost impossible to get over it as everyone else so happily put it. If you wish to boost her confidence, find things she's good at, go hang out at her house and mess around with makeup and dressing up (sounds childish if you say "play dress up" but all teens do it to a certain extent) Go hang out together go places you're both comfortable, but try to get her to experience more activities, you can't actually boost someones confidence in one sitting. So try to be a good friend, and tell her next time to tell the senior, "thanks, but I like them" and walk off. even if it is an act, people just like reactions.