I am 5 feet, on a good day maybe 5 feet 1 inch. I have been trying to box jump a box that is about my hip level. I manage to jump it probably 1 out of every 5 tries. The box that is 6 inches shorter I can jump with no difficulty. It is all mental. The higher box is intimidating and it hurts if you miss. I have had the bruises to show it. I don’t give up. I at least try it, and sometimes succeed. Each time I attempt it I get a little better at jumping on the box. I guess I am trying to be motivational.
You have to at least try what is challenging you, because you can’t overcome it if you don’t try.
This is the box I attempt to jump. The box to the left I can jump with room to spare. That is how I know I need to jump the big one.