maybe try and hone in on what it is that you are putting up walls for-what type of situation you don't want to get in to, or just bascily, your fears, worst case scenerio.

Communicating; always fun
I'm not sure exactly your situation, but from my own experience, I find that the hardest things to communicate

1. my needs/expectations/desires
2. that I am hurt.

The first one can suck for a partner cuz it can lead to them not knowing how to please you, amoungst other things, and the second one, I think, creates the most problems. If you get hurt, but are afraid to tell a person that you don't like being treated that way (because of fear of a reaction, like pushing them away) then you just end up burying it, holding it in, and the anger/hurt just pretty much builds from there.

Wording can be hard too. Whatever you're going through, I hope you keep talking about it-the more you communicate-the better ya get at it, lol!

Take care,
-obj