I was like this growing up and in my early 20s, but once I really understood that I had people who actually love me and supports me, my "sensitivity" got a lot better. It's important to know who actually matters in your life and who doesn't really (for example not being too attached to some "friends" who don't actually care about you). Sometimes it's really good just to remind yourself that some things don't matter to your life, and some things people say or think about you really don't matter. In my 30s I'm much better, now that I'm living with a very supportive loving boyfriend.