Personally I think that it is a talent you are born with, like singing or playing football. You can certainly be taught to draw or paint better than you do now, though I think that all the brilliant artists (and come on now, there aren't many of them around!) are born not made.
But why not have a go? As I've said, you can be taught to be better than you are now, but your enjoyment is the most important thing, and if you enjoy drawing or painting then do it!