advice

My so and I started having sex about 2 months ago. We both lost our virginitys to each other. Every time we have sex he enjoys it more than I do. I expected sex to feel better!! When were done I don't really feel satisfied and I get moody he asks me what's wrong and i say nothing just tired. Is he not good because he's never had sex before and he doesn't really know what to do? I wanna talk to him about it Of course not be a bitch a tell him he's not good but I just don't know what to tell him. I love him very much and we get along so well but I've heard that good sex is also the key to a good relationship and I don't want this to mess it up..so how do I talk to him about it?