Need some advice please

So I have a lot of my mind. Boyfriend and I are having communication issues. We both are new since it’s our first real relationship. We use to work together and now we don’t and he works night shifts and I work days at completely different work places. We try to make time to see each other once to three times a week. We also are learn what we like with each other sexually. We had a talk last night and he felt he was ready for sex. I told him I wasn’t really ready mentally and obviously anyone could be ready physically come on it feels nice🤷🏼‍♀️. But he also has some other stuff going on but he is so closed off in his head he doesn’t really wanna share it I guess. And sometimes I think my problems i put more importance into them then his issues if he wants to discuss him. I also feel like maybe I am a bad girlfriend from holding him back from experimenting in what he thinks would be nice. Am I being greedy? Is this normal? There is more to the story but these parts have been on my mind all day