Need advice please

I've never had an orgasm when I have sex with my boyfriend. I don't know what works to get me to orgasm with him either. I've dropped hints by sending him screenshots of different positions, but I don't think he remembers these things when we're actually together. So any ideas on how to kinda guide him so that the sex is better for me? I always feel bad telling him bc he feels like he's not good enough for me.