Sex questions

I wanted to know how to ride my boyfriend, I just recently started having sex and for my first time it did not hurt at all. As well as, he wanted to do a round 2, and we did it for about 30mins and he didnt cum? What does that mean? Does it mean that I wasn’t good enough? We did several different positions and towards the end he got soft again. This is my first time and I’m overthinking about it.