Can't do it

I just try and fail every time I masturbate. I can't put it inside my mouth. The majority of the time I masterbate is because I want to eat it very much. I've tried many methods , like glass or sniffing or wait, and I can't. I'm straight, but I think doing that is sexy and turns me on instantly. I heard about ruining orgasm but I didn't understand and I think it is a waste of time.

do you have any advice for my situation