Your telling me you have never masturbated.
An orgasm is the point at which you go over the edge and all your muscle contract and release. You feel a rush and then you go weak.
You feel exhaulted and relax.
As far as you having one it is rather easy.
When you have an erection stroke it until the pressure builds up and you release.
But remember that there is no pressure on you to find any of these things out.
I would recommened that you sit down with your parents and find these things out.
But we will help answer your questions the best that we can.
Go look at this web site.
http://www.coolnurse.com/orgasm_female.htm