Inexperienced, need advice!

I need to vent and need advice!! Here's some background;

I broke things off with my ex, he was 23, of 7 years. I was growing away from him, I am 22 and am moving up at work, recently bought a house with my mom and have been financially able to take care of myself for years now. He didn't want to by a home, hasn't finished high school and wasnt motivated to improve until a few months ago. But it was too late for me.

I've shared all this with him multiple times leading up to it but he wouldn't and so I decided to end it. I am cutting all ties, from possessions that remind me of him to taking him off my nextflix account. I want to focus on me, do what I want without answering to anyone, go out with family or friends with out having to be home at a certain time.

Okay. So next:

I met someone at work, he's 27. We're becoming friends, he's funny, caring, and such a gentleman. We have hung out quite a bit and twice it progressed to sleeping together. And it has been so good, something different.. no strings attached. Its nice, and there's no obligations.

One problem- he doesn't finish.

While we are going, i can see he's enjoying it and from what he tells me he likes everything about me, but he'll make comments its because he's too old, or he can't keep up. And I've asked, is there something about me that isn't enough/ or anything? And he'll tell me no, you're perfect, fun, sexy, exciting and (sorry tmi) the p***sy is tight. He'll pick me up, flip me over, do what he wants but still he hasn't.

I could tell it bothers him, but I am always positive about it and make him feel better. I don't want him to be embarrassed or feel like hes ruin it. On the contrary, I dont mind, but I don't feel thats fair either, I want him to feel just as good.

He does smoke weed, could that be the problem, hes smoked since 15. Or am I maybe being too fast in bed, im something different for him too? Hes told me he hasn't been with someone as young as me.

He is only the second person I've been sexually active with.. so i don't have much experience to go on..

Or should I not care?.... or im caring too much? this is new to me and I want to make sure hes having fun too. But don't want to be over bearing either. I'm learning to balance this.

Tips/ advice please.