physical exam

I'm 17 and I have my physical exam tomorrow. I've had about 3 or 4 physical exams in the past, none of which I was sexually active during the time. Now that I'm no longer a virgin, will the doctor have to look/touch my vagina to check for STIs??? My last few exams she just took a quick look and that's all. I'm not sure why I'm so worried in the first place.