I had that problem too, for many many years. I'd get to a certain point and then just stop myself because of fear of going over the abyss. It wasn't until I met the man who is now my husband, at 27, that I had my first orgasm....after that, there was no stopping me.
Serious advice.....do it yourself first. If you want help letting go, either have a drink, smoke a joint or something, and then spend some time by yourself in an environment where nobody is going to walk in on you and you feel totally safe (well, as safe as an emet can ever feel). Explore yourself for a while without thinking about the need to get to orgasm, just keep going with what feels good.
Oh, and another great piece of advice. Get yourself a good vibrator!
<font size=\"4\"><font color=MAGENTA><font face=\"Times New Roman, Times, serif\">It can, and does, get better with time.</font></font></font>