how to stop feeling bad after masturbating

Hi!! 21F here, I never have had an issue like this before but I’m finding it hard to cope with.
I have a very high sex drive in comparison to my partner 21M of 4 years, we have sex maybe 2-3 times a month. Because of this, I find myself masturbating on my own almost everytime he leaves the house and that’s almost every day (we live together) I end up feeling an insane amount of guilt after I’ve finished. How should I deal with this? I’ve already spoke to my partner about this and he assures me that it’s normal but I can’t stop feeling guilty! Also how can I stop doing it so
often?! 🥲🥲