I'm sure that your boyfriend doesn't mind the slightest, if he loves you then it shouldn't matter if you are a size eight or a twelve, if it matters then he clearly isn't worth it.
After being in a relationship for two years, it should no longer be about appearance, so don't worry about it. If it gets to you then you can change how you look with a balanced diet and plenty of excercise.
Don't worry about the porn though, it's not important and it shouldn't get to you as many men (and women) watch porn but if you actually look at what porn consists of, it's full of "perfect" men and women. Don't sit and compare yourself to those women though, it only gets you down. Yes there is a difference but nobody is the same, everyone is different shapes and sizes, it's not something you should take personally at all. I'm sure when he is watching it he isn't comparing you to them, so don't you do it either.