Are you sure you want to take advice from someone so imperfect? *grin* Unrealistic expectations is a much more prevalent problem than recognized. The vast majority of the media industry is based on selling us the unrealistic.
Recognizing that you have an issue is the first step. The next step is to curtail your viewing. That doesn't mean that you have to stop entirely, just limit it. If you always use porn to satisfy your desires, then you won't adapt to the real world. As your ratio of real world experience to porn increases, you will find that your expectations and desires will change. Porn won't stop being appealing, however your horizons should broaden.
Second, work on getting to know real people better. One thing porn can't do is provide a connection, only real people can do that (so far). You may find that there are things other than physical appearance that draws you and that there is more to sex than just the climax.
It won't happen overnight. Depending on how stringent you cut back on your use and how social you are, it could take six months to several years before your expectations are back to being realistic.