Maybe the over-thinking here stems from the fact that you don't really know this person and your gut is telling you to slow down and keep your expectations in check.
In other words, your anxiety is flaring but you're attributing it to the wrong source (porn) It is quite risky to try to jump into something long-distance when you have no previous experience with the person and it will inherently be much more difficult to get to know each other. My sense is that this what your fear is stemming from, and understandably so, but you have assumed some prior porn use is the root. It's not.
Enjoy your first meet-up but keep both feet on the ground.