Vaseline. Smear it on, wait 30 seconds and wash it off.

However if you are 14, you may be ready to wear makeup in your own right, not just your sisters. Ask your mom about it and she may be OK with you wearing it. Ask her and your sisters advice, and in the future don't use your sisters makeup (unless you have express premission). In 6 years if my little sister was using my makeup, I wouldn't be too thrilled. Ask in the future, but for now use Vaseline. I've heard it works well as a remover.