Not ok with showering together

I am afraid to shower with my bf who I've been living with for a long time because 1. My mascara runs all down my face in the shower. 2. In the past when I'd shower with a guy I'd get really cold cuz I need all the water to myself. 3. I don't like the way I look with totally wet hair, I think I look ugly like that tbh. And 4. Shower sex is uncomfortable. But my bf got upset when he asked me one time just to shower together no sex and I said no. I want to be intimate with him in this way but these things are stopping me 😔