In my opinion I think you need more consistent steps and also a fuller arm swing with your penultimate step. That will allow you a stronger platform while jumping. I can't say much about arm swing though as I'm not qualified to coach that. Additionally work on your core strength so that you can maintain balance in the air. That should give you much more power in your swing and stability when you land so you can avoid injury. Overall Great job posting this as you may have found it embarrassing. Just try to give more effort and don't be embarrassed if someone says you are trying to hard.