Welcome to LessWrong!

I would say that if you're interested in rationality, you belong here. It doesn't matter if you're not that good at it yet, as long as you're interested and want to improve then I would say this is where you should be.

Be careful of the priming effects of calling yourself bad at rationality, questioning your place here, saying you'll never escape a drug addiction, etc. etc. The article on cached selves might be somewhat relevant.