Growing Up Too Fast

I've always been the responsible one in my family, you know, the oldest sibling who's supposed to set a good example and take care of everyone else. But sometimes I feel like I'm growing up too quickly. It's hard not being able to enjoy some of those teenage years that seem so carefree from an outsider’s perspective. My little brother is always complaining about how much I nag him, but it’s tough when I want to be a role model yet also just have fun sometimes. Is it normal for older siblings to feel this way? How do you balance being the responsible one with still having your own life and interests?