Why am I unable to reach an orgasm?

Do you orgasm when you masturbate by yourself? If yes, how do you do it? Rubbing your clitoris, humping, inserting something in your vagina or anu, something else? If no, when last did you try, and what did it feel like, why did you stop?

No I don't on my own. I have tried rubbing the clitoris as well as trying to find the "g spot". Jen that failed to work I tried vibrators and other various toys. I have not tried anything anally. Last time I tried it did feel good. I am easily self lubricated. It just felt as if there was pressure where I was touching and that stimulated sensations but quite dull. I stopped because I had been trying for over an hour and it was starting to become sore.