It's weird that you have started jumping before learning to canter. Where I go for my lessons we walk, trot, canter and then starts on jumping.
I started my lessons in October and have been learning how to canter in the last 4 weeks. First just the transition from trot to canter (and canter just for a couple of seconds) then back to trot. Once I was more confident with this I moved to a more forward going horse and was doing canter for half or one 40 meters circle. Then the last 2 lessons on a faster horse for longer (finally got the hang of it at my last lesson!). It depends on your coach , mine is more keen to make me try things even if not everything was perfect at the trot and I should start jumping soon. She knows I am willing to try things so maybe ask your coach when she/he things you could have a go. I think I'm doing not too bad for a "mature" student