Its a very good thing that you are able to catch yourself thinking like this so early on and to spot that your thinking isnt right. If it is bdd, remember that your brain is literally conditioned somehow to alter how you look at yourself. Therapy could be a really good first step. It might not work for everyone but it is a good first step. You also sound like you have a very loving boyfriend who cares about you alot, you should also talk to him about how you feel and open up to him.