You don't suck at your powers, you're learning. And that's okay. You know, when some of the big famous X-Men were learning their powers, they had all kinds of accidents. When I was learning to fly, Teddy had to keep catching me because I kept getting scared and falling out of the sky. When you're bigger, and you've practised more, you're gonna be so super powerful and even more awesome than you already are.
Did Miss Rogue tell you about what happened to Tommy?