There's nothing inherently wrong with watching porn. Most people do. For the most part, it's a normal and healthy expression of sexuality. As long as you understand that porn is fiction and bears about as much resemblance to real sex as the Fast and Furious movies do to real driving, you should be fine.
You're probably not "addicted" to porn. Can you be addicted to porn? Sure, but you can technically be addicted to anything. Porn is not chemically addictive the way, say, some drugs are. In fact, watching a lot of porn doesn't predict problematic porn usage--but thinking porn is morally wrong does. So basically, you aren't likely to wind up having a problematic relationship with porn unless you already feel guilty for watching it.
Eh. We know violent video games don't cause violence, so I see no reason to assume porn works any differently. Fair enough if that's not your thing, though.