Maturing isn't always easy. To be mature you respect your friends and family and listen to your teachers. When someone irritates you, the mature way to go is to respond in a calm voice that you don't want them to irritate you or your trying to work or that you don't want to engage in a fight.
Don't expect to one day wake up and become mature. You will find out how over time. Just remember to obey your parents and teachers and to be polite.
I hope you found this useful! :)
-Kitt