I can't feel myself cum

I can never feel myself cumming. I am sexually active and the only time I think I cum is when he eats me out. When he is downtown, I know when I cum is because I feel an orgasm, but I can never warn him that I'm cumming...it just happens. I definitely can't feel myself cumming when he is inside. I wonder because I like being penetrated, but I can't seem to get off before he does and I always leave in satisfied.  Is there something wrong with me? Is cumming and an orgasm the same thing? Or is it normal to not feel yourself cumming?.