If you haven't already, you could read about the stages of orgasm. It helps to know what to expect and to know to keep going. If you just go by that felt really good, so good I had to jump up, stop, etc. you can easily stop too soon. Keep going until it feels alarmingly good, you want to involuntarily touch or kiss whatever person or thing is around, and you feel like laying there soaking up how good you feel.
But stop if you're having to try too hard or strain. You can always keep trying in a more relaxed way.