When I first voiced my desire to pursue a career in music to my friends and family, it was met with a lot of pessimism. It felt like all they could see were the thousands of ways in which I could possibly fail to achieve my goal. Some support!
Once I had made very clear that I would rather try and fail than not try at all, most of the concern went away. I guess they weren't really trying to discourage me, but rather needed to be reassured that
I had considered the possibility of failure. They had to know that I wasn't going to pursue this all starry eyed and blind sighted.
Of course, nowadays they buy me iPods with "Hold on to your dreams, Jim" engraved on the back for my birthdays... go figure