trouble orgasming

Okay So I'm sure I'm not the only one who has trouble with this. I have never orgasmed. Me and my babe have amazing sex but it never gets to the point where I'm like holy shit and I never have the biological signs of an orgasm (vaginal muscle contractions, etc.) I've tried masturbating (clitoral stimulation) and it makes me feel good but I can't tell if it's an orgasm or me just being really turned on? Someone who knows what's up or anything that I can try to help me get there PLEASE SHARE lol thanks!