"First you have to relax you are still young and most women arent able to orgasm until their early 20s"
That is from an above post. What do you mean most women aren't able to orgasm until their early 20s?!! That's ridiculous - there's nothing stopping young people from reaching orgasm - I had my first one when I was ten! Maybe you actually mean orgasming through sex...
Anyway, I agree that it's pretty difficult to orgasm from someone else when you've never done it to yourself. I would work on the masturbating thing - do something that really turns you on, like creating an elaborate sex fantasy in your head. Spend a lot of time getting in the right mood, and make it a whole body experience - you've prolly got spots all over your body that turn you on - not just your clit, or nipples. You could try masturbating with your fingers, or a vibrator on your clit, or under a stream of water in the bathtub (remember, only let the water flow over your clit, and not directly into your vagina - it is dangerous to do that). Try to focus solely on the pleasure that you're getting from the masturbating, and don't think about orgasming! Thinking about getting an orgasm is one of the things that will stop you getting an orgasm, most likely!
If you really try and focus on pleasuring yourself, I mean reeeeally setting aside some time for it and practicing!, and you still can hardly get anything from it, there would be no harm mentioning it to your doctor next time you go, but really I don't think there's anything wrong with you. Keep trying, and good luck!