Typical troubled teen?

I seem to be happy and able to laugh on the outside, but sometimes, when I'm not even thinking about anything sad, I suddenly want to cry. People's first impression of me is that I am a dark, unemotional person. I have had many problems in the past ever since early childhood and I still have a hard time going through life. These probems aren't as serious as physical abuse from parents or such, but they are very emotional. My mom often says things such as wishing that she had drowned me as a baby or that I am incompetent at everything. My dad doesn't really seem to care. As a small kid, my mom pushed me academically. From the time when I was 3, I was able to count to 100. I started multiplication and division in kindergarten. By the time I was in 4th grade, I could play Beethoven, Mozart, Bach, and other clical composer pieces on the piano. On top of that, my parents had marriage problems that were traumatizing to get caught in the middle of.