Do you compete when meditating? Can you stay on the cushion longer than everyone else?
What about the results of your meditation? Are you efficiently achieving the targets?
Do you feel you are above all the other meditators and even the teacher at the front?
If such thoughts dominate your mind while meditating, you need to learn what NOT to do while meditating.
Download and read this piece by Ken McLeod here: 6 ways to not meditate