I agree with everything jenn said, but also have a question.
This bumpiness that you're asking about... Is it internal or external? Are you talking about the inside of your vagina or the opening to it?
Because the inside of the vagina does have a sort of "bumpy" texture to it. That's completely normal.
I would suggest having an annual done anyway. My mother made me start getting paps annually once I started menses. It mattered not that I wasn't sexually active. Of course, i've seriously slacked off on them in my adult years (i'm waiting to not be bleeding long enough to schedule an exam!!!), but it really is effective in catching any possibly life-threatening problems early. Good luck to you!