I used to try to sing, but I was never very good at it... same thing as what others have said: terrible tone, always off key, and mostly I was surrounded by better singers. So I focused on what I can do best which is play keyboards. I wound up playing behind a lot of singers but eventually I decided to go solo and play instrumental music only. It has turned out to be a much better situation than any of my former gigs with singers. So the moral of the story is to focus on your musical strengths and develop good business and interpersonal skills.