I'm sorry you feel that way. Judging from everybody else's posts so far, it's pretty evident that you're not alone in feeling insecure about one's artistic skills (at pretty much every level) so I hope you don't feel too bad about that.
I think what has helped me personally with this insecurity is the feeling of joy I get while I'm drawing. There is nothing that could make me happier than when I'm drawing something, even if the end results don't turn out the way I'd liked them to (because then I can just delete it or throw it away or slip it in the back of my drawer). I think it's important to hold on to that, whatever creative thing you seek to do, I think you need to always remember how much you enjoy creating something.
What I also think helps is not to dwell too much on what you've made. I know it's hard not to feel a strong attachment to your work because it's essentially a piece of yourself and you worked hard on it, but the sooner you can move on to start on something new, the less time you'll have to stare at the previous work and nitpick at every single thing you think you should have done better. That isn't to say that you shouldn't like what you've made. You should respect it and appreciate it for what it is, but learn when to move on.
We're all going to suck when we start out and who knows if that feeling of not being good enough is ever going to go away. But art's not really a competitive sport, there's no scores or time limits, and there's no rule that says only a bunch of people can win the game.
Anyway... sorry for the wall of text. I give you virtual hug yes? You're doing great!