Depression and lonely

I am 33 years old middle age woman. When i see other girls in their 20's I feel so old and less attractive. I jealous them. I can't even get pregnant. I don't have best friend. I have a job in the office I don't like my job. My so plays with his computer games all the time when he gets moody I feel unhappy. When he or other people around me are nice to me and happy I am happier. Most of times I am sad and unhappy. Is this a depression? Or what could i should do a daily basis to be more happy?