What is it like to go to court for not stopping at a stop sign?

A couple months ago, I was driving to college, the way i go every day. then i come up to is this very residential back road that is empty most of the time. there is this really random stop sign, and when you pull up to it, going straight, on the left is another road (also with a stop sign), and on the right is someones DRIVEWAY. its a totally random and unnecessary stop sign. I slowed down a bit, looked both ways, and slightly rolled through it. little did i know, a cop was hiding in the bushes (probably bc he knows its a stupid stop sign that no one cares about). he pulls me over, and asks me if i know why. i say “was it the stop sign?” clearly because thats the last thing i did, and i wasnt speeding. he says yes, thats why. long story short he gave me a ticket and our conversation was written on it. he wrote that i said “yes” when he asked if i knew why he pulled me over!!! this was the first time i was ever pulled over, and my mom told me to plead not guilty. so i did that. and now i have court in a few days and im really nervous. i have social anxiety. can i technically even plead not guilty when the cop wrote down that i said “yes” when he asked me if i knew why i was being pulled over??? even when i didnt exactly say yes??? and what should i tell the judge, since i already pleaded not guilty? my mom pays for the insurance and i really dont want it to go up because of me and some ridiculous ticket