You need to find the reason that you do think about this. You didn't mention things about your husband that were non-sex related, so you have to work on things inside you that *are* sex related. You didn't mention that he had numerous friends who he went to see movies with. You didn't mention his high school <something>ball team that he was on and that he had a great time doing that. All healthy stuff. Now, is sex healthy? Sure (for the most part). He was doing a healthy, human act. He probably also ate food, drank liquids and even wore fancy clothes from time to time.

You aren't damaged at all, really - but I would suggest maybe one or two visits with a therapist to go over your own thinking about sex itself to see if the jealousy is based on something that happened in your life. It simply could be that you wanted to have sex younger but didn't and are feeling empty in that "well he got to do it but I didn't...I'm not good enough". You are good enough - but you waited to meet the right person and get married to do that. See if the jealousy you have for him, as you say, isn't some type of inward-directed jealousy you have about your own life. If you do find that - you can forgive yourself and move on.

The most baseless type of jealousy is that which is directed at someone you know now that occurred before you knew them. Definitely something out of your control.