Are you on any medications? Some can affect this, especially antidepressants. Do you masturbate? That's often a good way to find out if you can reach one or not as you are in complete control. The other thing to do is find a partner who is really good at sex. Hard to tell at first, but with enough attempts the two of you can try different things until you find what works. Sometimes a particular person needs to feel something for another person to get an orgasm. If you find a partner, try oral sex. A guy or woman who knows the clitoris really well can get right to where the sweet spot is. But again, just suggestions, only trial and error and determining if there's something physical going on or something psychological is going on. You don't need to get wet to reach orgasm, though it does help.