My first OBGYN appointment..

I’m not which sure which group this belongs in..but I need help. I was sexually abused and molested at a very young age. I’ve never had an obgyn appointment before. I am 21, and after being prescribed ADHD Medication I was scheduled an obgyn appointment for the 30th. I’m terrified of someone else down there, touching me. And it makes me want to cancel the appointment. How to find the strength to just go through with it?