Withdrawn/aggressive. It was the only way I knew how to act as a child, and it's how I still act under stress. When I became depressed, I just withdrew from the situation, lest anyone see me as a flawed individual. When I suffered from panic attacks or was cornered and unable to withdraw, I lashed out at everyone around me in a very aggressive manner.
Oh, and how this has affected my relationships? Well, I recall getting invited out to a certain bar, comparing myself to other people, becoming self-critical and depressed, and then just leaving with little or no warning to my friends who invited me out. In another instance, namely my high school graduation, I had a panic attack and became aggressive toward my family and girlfriend at the time.. we broke up shortly after.
So, yeah.. major problems that I needed to solve.