I’m still new to this sex thing

I’ve only ever orgasmed with a vibrator. Haven’t had sex in about 2 years. Even the last time I did it wasn’t the most comfortable.

This time, different guy who I really really like. We had foreplay so lubrication wasn’t the issue but I was still so tight that he couldn’t get it in.

Different day, we have foreplay again. I’m soaking, but still had some trouble getting it in with missionary. Was finally able to get it in from the back. It wasn’t painful, I felt him going in and out of me but it didn’t feel “good”. Is it because I’m not used to having sex? Will this feeling go away the more we engage? What’s missing here? He was able to get his.

When did sex start feeling good for you?