I've been singing since first grade and I love singing, though I'm a bit shy...
To be honest, singing is not a thing you can do for a living. I mean, not in your situation, because you obviously haven't sung before... I guess pro singers were born with the dream to sing and they just worked hard for making it come true.
I strongly believe that being born with a good voice is necessary. But not always... There are some people who think that they're a total crap and then somebody tells them they're good.
But if you have the confidence that you CAN actually sing and if you enjoy it, there is no reason for you not to give it a try.
By the way, singing is not something sooo much different from other hobbies. It's like doing a sport but with your voice
Plus, nobody expects a Mariah Carey coming out of your mouth, right? :]