I feel like my 7-year old child rules my life.

My son is 7 years old. He is an only child. He seems to be able only to entertain himself with TV, video games, friends or direct parental interaction. I enjoy interacting with him, but sometimes I need a break. It feels like the 14-hour kid show. I don't want the TV/video games on excessively, sometimes a friend is not available for play, and sometimes I just don't have the energy/interest to play. I also suffer from seasonal affective disorder, so sometimes I get the blues and am just not the most fun person in the world. I feel bad for a number of reasons: firstly, he has a father and mother who both suffer from depression, so we are sometimes not at our most playful; secondly, I worry that he will have problems with depression because of our genes; thirdly, he has no siblings. Sometimes, I need a little space, and the more I try to get a little space, the more he demands my attention. I love him, and I want him to be happy and well-developed, but I don't want to feel responsible for, and guilt-ridden over his need for happiness and enjoyment. Sometimes I think I should not have become a mother. Maybe I am just too selfish.