I suppose my minor depression... Put simply, I used to have terrible self esteem issues, which drove me to feel that everyone hated me. I kept that from them, but they started to pick up on it, and asked me about it all the time. Eventually, I 'fessed up and they were really supportive, but I could tell they were just trying to make sure I didn't off myself.
It's OK, I got over it, and once I started taking
(does it show that I just discovered strikethrough? Fun Times.)
(in case you didn't get it, the strikethrough'd things are jokes...)