Hi Zooweemama.1,
One of the things that doesn't really get talked about when it comes to sex is that it can feel a TON of different ways, and that how it feels can vary for a given person from instance to instance. Too, the biggest factor in how sex feels is the brain; if it's not engaged, not turned on, or picking up on some negative stuff, sex is unlikely to feel good. In your case, it's very possible that being able to tell your boyfriend was focused on himself instead of both of you was just a big arousal killer. Does that make sense?
I think you may find this article about a similar experience helpful right now:
https://www.scarleteen.com/article/rela ... l_there_is
Would it be helpful to talk about some ways to help make partnered sex more pleasurable for the next time you decide to have it?