Being comfortable trying new things in bed...

Okay soooo I’ve been with my boyfriend for just over 3 years now, our sex has always been good and typically it’s rough and mind blowing, mainly bc both of our favorite position is doggy style...but lately he’s been telling me during sex to rub myself while he’s putting the condom on or while he’s going in and out and for some reason I’m SO uncomfortable doing that. I’m so comfortable with him that’s not the problem, i think it’s the rubbing my clit myself that makes me uncomfortable. Idk why! Is that weird?? He’s okay with me like not doing it bc he can tell it makes me uncomfortable but i want to please him ya know? I want to be able to turn him on even more during sex but idk how. Even when i masturbate i don’t touch myself i just use a vibrator, so maybe that’s why I’m uncomfortable? Any other ideas on how to spice sex up a little?