Ah, oral sex. To fix it or make it better, I would advise discussing with the partner on what is best for you to reach an orgasm and try to work you up in different ways. I gotta say the obvious and no teeth, and not too much tongue. Makes me squirm and not in a good way.
Being willing and eager to venture south is only half OK, maybe 70 percent of the battle — just doing oral isn't enough sometimes. There are things to know, things to literally never do again, and things you can improve. A vagina isn't a clamshell about to snap down on your tongue, and there is no reason to be scared of going down there. By now, in this time of feminist strife, men should have no excuse for being afraid of or grossed out by oral sex if it's something their partner is into.