“If you’re not good, it means you’re not supposed to be doing it” I heard that a few times in my life. You don’t have to be good to do anything, you just have to do it!
I like to take the exemple of Mike Krahulik and Jerry Holkins, creators of penny-arcade.com. Mike said that he wanted to create a web comic but he didn’t know how to draw properly. He just did it anyway and he became good in the process.
The things you’re good at might not be the things you want to do. Just do what you want to do long enough and you’ll be good at it.