Usually many female do not know what an orgasm is like. Its widely reported in literature in varied forms, but in reality few experience it.
It's like eating a chocolate. Some relish the taste to feel very excited, but some do not feel anything about it. It may have something to do with the person's upbringing too. For a person to experience orgasm, one has to "let go".....This wanton abandonment coupled with clitoral stimulation may help you experience it. But it's not a feeling which can be described exactly.
During sex, when one is aroused, the pelvic organs gets engorged with blood and so does the area around the vaginal opening and clitoris. At orgasm, the intense engorged organs like uterus, para vaginal muscles undergo develop a tremor like contractions which are fine twitches, and these may be felt or may not get registered by the person if she is high strung.
So learn to relax while at sex.
Next Steps
Indulge in body massages, and slowly get intouch with your body when it's relaxed, feeling the beat of the heart against your chest wall, or the rhythmic pulsations of the vessels in the body. You can decipher the orgasmic sensations only when you can feel the minute alterations which happen
Health Tips
Some ladies may have a high threshold for pleasure, and they need to have more intense clitoral stimulation like via a shower spout or local massage for a prolonged time. so try these and see.