Pap-smear

So I just turned 21 and was told now I’m “of age” I need to get one done. I’ve never had one (obviously) and I’m a little nervous about the entire idea of it. I’m sure I’m just freaking myself out but I keep thinking okay what if I go and somethings wrong or what if I go and they find something. What should I really expect and is it really as scary as I’m setting up in my mind?