I was the same after my first trail on my 3 year old. Granted he was 2 and 10 months. I ponied him and he was good, only spooked at a bus coming past and apart from that he just kept tring to play with the horse I was riding! Cheeky bugger
The first time I rode him was like a week after that ride and he was doing great. Until I stopped to wait for someone that was riding bareback to remount and the rest of the group got really far ahead. He got upset and I wouldn't let him canter and catch up, I just made him walk. He settled and started to walk nicely so I decided to try and trot a few steps. A bus came past and he bucked. 3 times. I stayed on, but now I'm really nervous that he's going to do it again. I rode him to pony club a month ago and he was great when we were walking but when we started trotting, he lost it and was jumping and spooking at everything.
I'm going to start ponying him again and then next year we'll be able to start trail riding again. We're just going to start by going around the little block and then the bigger block and then when he has that down, try extending it a bit more.
You're lucky you have someone else that can trail safe your horse for you.