I know you'll get lots of great replies here, so mine is brief:

1) Bike fit, fit, fit. The bike fit can seriously affect the comfort of your crotch.

2) If you get the bike fitted and you know the fit is not the problem, really try out a lot of different saddles. It took me about 5 to find the one that really works for me. Makes all the difference.

Good luck! And, good for you for riding your bike and setting STP as your goal!!