Around 2 years ago I noticed a strange 'growth' on my nuts. At first, I figured it was just a hygiene problem. So I started to shower everyday(I used to fore-go showers due to less time on computer), and sure enough it got bigger. Over the past year I have naturally gotten more and more worried, tried everything I can think of and every explanation excluding STD. I have had a few sexual encounters, I got a bj once and gave a few. Unprotected of course. I didnt really believe I could get a STD since I was pretty inactive sexually, and also a bit of wishful thinking played its part in that. I dont feel like telling my parents. Problem is, I have never even gone to a doctor on my own, I have no idea what to do. And if I did, I couldnt pay for it.
I need some ideas on how to find out what it is exactly, pictures / explanations of various STD's havent really helped, ive researched a lot on google and no STD that I have looked up fits my symptoms, the only symptom I have is a wart-ish growth. Thus why I havent done much about it. Anyone know anything I can do, excluding parent involvement?

I apologize if this isnt the right place to post this kind of thing, I did look for some rules but couldnt find them..