I love God , but since 11 have had a problem with reading yaoi. I know it's wrong but it's hard to stop reading. I'm really worried about how this might affect my faith in the long run and if it's that bad of a problem .
Unpopular opinion on this website, I'm sure, but: There's nothin' wrong with that. It's fiction. It's entertainment. Even if you believe it's wrong in real life (not even touching that debate here), it's just fiction.
Then again, I told myself that when I was a Christian and look at me now. (Kidding; that had nothing to do with my becoming an atheist.)
In all seriousness, if you feel dirty or gross doing something: don't do it. It's clearly causing you distress. If you're uncertain if it's wrong, look into it more. See different opinions on the subject, and come to your own conclusion. But if it really makes you feel bad, avoid it. Or cut back a little. No pleasure should ever be guilty. If you're ashamed of it, you shouldn't be doing it.