First of all, it's important to recognize that your boyfriend's behavior has nothing to do with you. The fact that he prefers the porn star "look" doesn't mean you are unattractive or worthless; it just means that that's his preference. Don't let his preferences dictate how you feel about yourself.

It sounds like your boyfriend's behavior is hurting you and that your sex life is suffering because of it. Your boyfriend is probably unable to see that his words and actions are causing your distress. I would have a frank talk with your boyfriend about this issue. Try to avoid accusing him of anything; if you tell him he has an addiction it will likely make him defensive and he may not be receptive to the rest of your feedback. Let him know that you understand he likes porn, but when he makes comparisons between your body and that of porn stars or pushes you to act out porn fantasies it makes you feel upset and uncomfortable. Make clear that you care about him and value your relationship, but that the way things are now is more hurtful than healthy. Ask him if in the future he could refrain from comparing your body to that of other girls and if your sex life can include things you feel comfortable with.

It's important to approach this from a standpoint of telling him what he can do to make your relationship healthy and happy rather than trying to limit his access to porn. If he can't implement that changes you talk about, however, it may be time to take a different approach. A healthy relationship should build your self-confidence, not tear it down. If he proves himself unable to stop comparing you to porn then you may need to decide if you can stay in the relationship.