I'm getting anxious about my gynecological exam

My period has been very irregular for the last two years; sometimes I have it, sometimes I don't. I went to a doctor at the university, but it was just with medication. This time I'm really scared that something could be wrong, but the thought of a gynecological exam drives me crazy. Will it hurt? How is it done? Is everything normal...? It's a situation that always bothers me. Despite this, I don't know whether to go or not. I can't tell if I'm just stressing myself out.