Also, if you go to the gyno, they'll be able to tell you about the HPV shot (Guardasil, I think?).

I started going to the gyno when I was around 18 (wasn't sexually active until I was... 22? 23?) because my cousin had a very close friend die from ovarian cancer in college. Better to err on the side of caution, especially when it comes to your health. Also, they'll do a breast examination to check for lumps and show you how to do one on your own. I had a benign lump removed when I was 20.

I'm not trying to scare you, just want you to know that these things can happen at any age, and like Typo said, it's a routine check up, once a year. I"ve also heard some colleges require full check ups for both males and females before starting.