Sex & masturbation

This may seem super strange, but what exactly am I suppose to be feeling during? I've had orgasms, some phenomenal and some meh. They just seem to hit me out of no where during. I don't think I'm supposed to be blind sided by an orgasm. Honestly I've felt so many types of sensations, I don't know what I'm supposed to stick with. They've all felt great but for different reasons. I've masturbated a couple times and have felt a deep warm pleasurable feeling that I can keep going for 15 min(rare). I've felt building of pressure to the point I cum (the usual). I've felt a sort of hunger pain that builds and just hits me with an orgasm. I've felt an annoying buzzing feeling, like my vagina needs me urgently. I feel like my vagina is slightly off, because no build up just feels the greatest. What do you all experience?