Being a sensitive + emotional person (Not a question, just venting)

I have always been an emotional and sensitive person and the older I get, the more it bothers me. There's nothing wrong with being emotional and sensitive, I just feel that I am these things when I don't need to be and that I should have thicker skin or not cry when it's something that I don't want to talk about or that makes me feel a certain type of way. This mostly happens because (I don't really have any real friends / friends at all other than my family and boyfriend) so I don't really talk to anyone and more often than not, keep how I'm really feeling and thinking to myself. I've tried to develop "thicker skin", be more aggressive, assertive and confident and not so emotional but always end up at square one. I thought a therapist would help and it did with some things but not with this whole situation necessarily. I basically am telling myself what I've heard from others for awhile...grow up.