I identify with this too. I was introverted, withdrawn and miserable for many years because of the constant conflict in my childhood. I DO think if I had had an outlet, someone to talk to, it would not have affected me so negatively. The fact that I was forced to bottle the emotions, fears, worries, and feelings inside is what messed me up so badly.
Even now, when conflict arises my first reaction is too withdraw and introvert which in turn causes my misery. Just in the past year have I realized this and have made a lot of progress. Now I am learning to be straightforward and deal with the conflict before it pushes me to withdraw.