I don't remember my first show, as I believe I was 5. But the first show I did with my previous horse, I was 12, and he was a 10 y/o previous GP horse, he took off around the jumping ring and I could not stop him. We cantered around the ring for a good 15 minutes before he decided he wanted to stop. Ha. I remember that like yesterday. At 14, my trainer put me up on a green horse I've never ridden before to do a 3'9 class. Needless to say, the horse went in the ring and refused to move. We were disqualified. I don't feel bad though, my trainer got on him and couldn't get him to move either. My trainer would put me in an eq class every now and then to ruffle my feathers. We never placed. My horse was just not the eq type. We took 2nd in the mini prix that day. Not every horse is built for every class, and same with riders. The more you show, the more your nerves go away. It's a learning experience for you and the horse.