I don't have a lot of talent.
What makes you say that?
I am not good at anything and therefore I am worthless.
No one is worthless because they can't determine where their real talents lie. Tearing yourself down for this is wrong-headed. Keep looking and trust that your talent will show itself to you when the time is right.
I just want to ring myself right now.
It's okay, really. Start focusing on your positive aspects and your mood will shift with it.