How to give more plasure to my partner?

Ok guys, this might be a stupid question, but I don't know what to do.

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​I'm dating a guy, he's cute and kind of a nymphomaniac. Really, if we didn't work, I wouldn't survive. So, I'm afraid that our sex life is becoming boring. Like, I'm always the bottom, but we're both versatile. I want to be the top, but I'm always afraid that I won't give him the same amount of pleasure.

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​Like, I feel it coming from inside when he is the top, but when it's me, I never feel like he's feeling the same.

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Do you guys have any tips? Don't came with that same thing "just ask him", he always say is good, but, I wanna do more than "good"