How to make my GF more comfortable in the bedroom.

(M 25) and my GF (F 22) Seems to dread having sex when it’s not the day she’s ovulating.
I typically have to beg for her to have sex and it’s humiliating. My sex drive is extremely high.

It seems like her sex drive is extremely low considering her age and she has also mentioned that sex can be painful because I have a larger penis.

Any tips on how to increase her libido, or make a larger penis more manageable for her?