My partner and I do not share a a bedroom. Often I will wake up at night to use the bathroom or get something to drink and discover my partner masturbating. I know this is a normal and healthy behavior. Why then do I struggle with this so much?

I often think I'm the only person on the planet who doesn't masturbate, so perhaps this is why I struggle with this. I know that even those who have a satisfying sex life masturbate, so why do I still feel so inadequate? Sometimes it's bothering me so much that I can't hide it and I end up sharing with my partner what is on my mind. He assures me he would rather have sex with me than himself.

My partner has a much higher sex drive than I do so I think he oftens assumes I don't want to without even asking me. Then I find him masturbating and my first thought is, "he didn't even ask me."

I'm so confused. Logically I know this is all normal but it still bothers me beyond belief.