Ejaculation/orgas[M] problem solved but how?

I just had interesting for me shower thought. I need explanation about my problem with no orgasms for the first year of my sex life. Now I have to move 14yrs back to explain everything. My first time happened when I was 18. Ngl I wasn't preparing for this, it happened just by accident with a nice girl from my group at university. She was one year older, she totally knew what to do. If I thought sometimes about my first time, I always wanted to do it with someone experienced cause I was really into sex as a virgin. The point is that I have never cum through classic masturbation. I had my own way to do it by squeezing my testicals in a specific way till I had an orgasm and my pants were wet from cum. So the first time was great, we tried many positions, she sucked me for really long trying to make me cum in her mouth but nothing. I felt pleasure all the time, dick was amazingly hard, she came few times but not me. I told her that maybe it's weed or beer that we had before. Next few dates with her ended up the same. Whole night, few hours of sex and I'm the one who's not finishing. Later I started meeting another girl, we decided to be FWB and all the same. Great sex, trying new things, every time I was horny as fuck, I was pumping her like a rabbit but no orgasm, no cum. It was about year since my first time and I got horny once on my own and decided to do it like it should be done. I finally made myself cum, it exploded for first time, I was pretty shocked cause wasn't expecting orgasm so strong. It was game changer, since then I had no problem with cumming by penetration. After 2 years it also was easier to cum by handjob or blowjob. The question is what was the problem?