On the other side of things tho....your riding was good. Especially for your 3rd season!
When you go up that wall ride type of thing that you built and you do a 180 off of, try to get a little more speed, pop a little more and bring your knees further up. I can tell your just baaaaarely making it around
But at 14 (actually at any age as well)---you really need a helmet. Im sure your mom would be glad to get you one