Gynecologist

What age do you start going to the gynecologist? I'm turning 13 in a month and I think I heard somewhere that you should start going when you're 13. Is that true? What kinds of things do they do? How often do you go? Sometimes when I post things that worry me on here asking for advice people say to talk to my gyno, which I don't have. Do they do any.. Exam kind of things down there? Or is that not something that happens there? Will they have my mom leave the room or will she have to stay? Oh yeah, it's a possibility I have PCOS because my mom has it and yeah. Thank you for answering any of my thousands of questions, haha.