Feminine health question. I'm really scared!!?

This may seem like TMI, but this is really scaring me...
Around the opening of my vagina is a round bulb-like/zit-like thing about the size of a pea, and it is very painful. What is it? What do I do?
However, I am a virgin so the chance of having an STD is impossible, right?
Also, I am 16 years old, if that helps.
I've always been very careful to have good hygiene...

I haven't told my mom yet because I'm afraid she might think I am having sex, which I am not.
I thought maybe I could get some advice through you guys on Yahoo! first...

Can anybody help me?
Please and thank you.
 
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