Newbie at this need advice!

Me (19M) and my gf (18F) have been dating for almost a year now and we recently decided to become sexual active and we both lost our Virginty to each other recently and I'm currently in a long distance situation we meet when I go back home and this time we had sex tbh it was just as i imagine it to be i went on for 4 hours I think and for 3 rounds but as i was her first she felt a bit pain but later it was all good but she didn't seem to cum like is there something I'm doing wrong that or is there something I'm missing? Also we tried 2-3 different positions too but she didn't seem to come close to cuming.. I'm confused and I seriously wanna please her!