Is it normal that I want to grow up faster?

yea but youre missing out on your
youth. you have your entire life to be mature and responsible, tired, over worked, etc. at 18 you should be mature when you need to be and relax when you have the free time. when your older you really wont have the time and youre gonna regret the fact that when you did you used it to do the same mundane things youre doing now.