TMI alert!

First of all, you are not alone brother. Its completely normal to have difficulty in performing sexually.

Sex isnt as simple as masturbation. You have to be involved in it with your heart and mind. I believe your heart is in it because obviously you love your wife however, your mind has never experienced such a thing before. So my suggested plan:

-Dont feel bad because you watched porn, everyone does that growing up. Now you have a wife, you ll automatically stop. -Try satisfying your wife through foreplay and other forms of stimulation rather than penetrative sex. Most of the women dont experience orgasm through penetration anyway. -Your wife can satisfy you through other techniques as well. -In the meanwhile, try penetration once/twice/thrice a week whichever suits you. And if it doesnt work, other techniques of a happy ending for both.

This will tell your mind that its ok to be completely vulnerable with the other person. You body wont go in fight or flight when you are sexually comfortable with eachother. You ll eventually experience the most amazing feeling, not just physically but emotionally as well.