Jealous of fiance's past

I am engaged to a wonderful woman. She was my high school sweetheart. After high school we went our separate ways and reconnected after over 30 years! I find myself extremely jealous of her past relationships to a point that I become almost angry about it. In high school she adored me and I just kind of broke it off and dated many other girls. I now have regret for all of the years that we lost because of me. I now see pics of her back then with other boyfriends and it drives me insane. I think the worst part is knowing that I gave her up and she was simply beautiful inside and out. We both have had many relationships over the years while we were apart including marriages. I see pics of her at the lake with the boy I know was her first at the age of 15 and I can't get it out of my head. I know this happened after her and I had first gone out and become somewhat intimate, but did not go all the way. The biggest part of this is the regret I have for not giving her my all back then. I know that things happen for a reason, but why can't I get this out of my head. Pics of her looking young and gorgeous in a tiny bikini and him with his hands all over her, knowing that it was at this time she lost her virginity to him makes me so jealous. I have to get past this for our happy future. We are very much in love and blessed to have been reconnected. She is also still very beautiful! Is this normal to have this bother me so much?? :(

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