Watch out, LostCat, that's not necessarily a good thing. Building a wall is just going to close all the thoughts and feelings and emotions (essentially, everything that makes up you) inside to simmer. You might be strong enough to maintain it forever (heaven knows how much we all wish we were that strong), but eventually the wall is just going to be one more issue you throw on top of the pile. Instead of helping, it's going to hinder. Eventually it will break--explosively, which is a lot worse than getting hurt by people (trust me). And it's embaressing too.
Don't close yourself off. Build a door into that wall, even if you have to put ten thousand locks on it. And make sure that at least one person has all the keys. Even if you only make one relationship in the real world, that is good enough. And remember, getting hurt is part of a relationship. You do it to them, too. As long as it's only once in a while, you need to preserve.
Please don't wall yourself in LostCat, it's not a good idea.
I understand and appreciate what you are saying about the door. I really don't think this will hinder me but thanks for the advice. I
talk to people but I never let anyone get CLOSE to me. I can see your point on how this could be a problem...