Just lost my virginity and I dont know what is happening!

I(22) M, started seeing this girl, but it was well established that she doesnt want a relationship. We started going out, first it was only cuddling on benches and then kissing (my first) and than making out until today. We started as usual to make out until i started touching her to see that she was wet and during the next hour I made her cum three times with my fingers. But during that i didnt cum once. We tried with hands and blowjobs but nothing made me finish. I was hard AF but i could not finish. At this point i said you know what this is not going anywhere might as well put it in to see how it will feel. It felt amazing being inside her. Still i did not finish but it felt great. I dont regret losing my virginity tonight but why did i now finish. She is a gorgeous woman and i find her very attractive and i love talking to her but something inside my head is keeping me. Does anyone had any similar experience and if yes please tell me what can i do differently?