Is it normal that i can tell when something's sexy but i don't feel anything ?

I look at hot pics and i notice in my mind that it's perfect in every way that i like, and yet i cannot feel anything "down there". when I do feel something it seems to happen at random, from nothing in particular. for this reason I cannot masturbate properly either. I masturbate in my dreams and it feels amazing, but the good feeling fades quickly as i wake up. Is this normal (for women)? I also seem to get feelings mixed up such as excitement and horniness. if something is really exciting it feels as good as being horny except the feeling does not 'exist' in the same way. And if something is really disgusting to my brain, it makes me feel tingly down below, sometimes in my lower back.