I don't mean to minimize your concern. Of course you wouldn't be here if you thought it was normal. However, and again I don't mean to offend you, but you could in fact have a "normal" teenage obsession with sex and porn.

If you are concerned and want help you are going to have to seek professional help. Nobody here can diagnose you.

Going to see a therapist does not mean you automatically need to be on psych meds.

I wouldn't be in a rush to diagnose yourself as bipolar though. That's heavy duty and you would probably be pushed to take meds.

Take it one step at a time. Talk to a therapist...take it slow