Lol @ "you're a virgin, how do you expect to have an orgasm". Do people actually say that? Odd.
Well, I had never orgasmed until I was 19. I had already had sex with a few partners to no avail, and realized that to expect someone else to make me orgasm without knowing my own body was BS. So, I commend you for trying to make yourself come. "Women need to train themselves to orgasm". This is often true.
How do you usually masturbate? Just using your hands? Most women can only orgasm from clit stimulation. Try rubbing your clit in circles. Start slow and if you don't get very wet, use lube. Build up the pace. It can take anything from 5-15 minutes for myself. It can be a lot of effort.
If that doesn't work, maybe you should consider getting some toys. The best thing to start out with would be a bullet (which are relatively cheap). They are little egg shaped toys that vibrate. Most have different intensities and speeds, so you can alternate and increase as your orgasm builds. Honestly, I orgasm every time I use a bullet without fail. If you want penetration, you can get a vibrator or a rabbit (which has clit stimulation AND penetration).
Feel free to ask any questions, hopefully I will be able to help.