Youth is not an excuse, but perhaps an explanation - because I have noticed a pattern in not only this post but others, in which you ask for feedback but are only open to hearing the positive. The changing of the story, etc is very much what I tend to get from my daughter (also 13) when she is trying to figure out what answer is most likely to "please" (aka end the conversation) at that moment but then the answer changes/evolves as questions are asked, time passes, etc.
It really boils down to you ARE young and inexperienced. You and, most especially, your horse would greatly benefit from some long-term solid teaching. Right now, neither of you is being served AT ALL by what you are doing. I don't think you want to hurt him or that you want anything but the best for him - but I also don't think you are equipped to make that happen on your own. If what you are doing is at the direction of an instructor, coach, etc, FIND ANOTHER because no good professional would encourage you to ride as you are. As it is right now, the horse and rider I see are not a good match. Something has to give and Rowdy isn't the one with control over that.