I'm Not Sure If It's Normal to Love My Little Brother So Much He Annoys Me

So here’s the thing. I’m the oldest of three siblings, and I have this weird relationship with my little brother, who’s five years younger than me. On one hand, I love him more than anyone in the world, he’s always been there through all those awkward teenage moments when no one else wanted to hang out with a bigger sister or bother explaining how to apply deodorant properly. But on the other hand? He drives me nuts sometimes. It's not just little brother stuff like borrowing my shoes and not returning them for weeks; it's also being overprotective of him, feeling frustrated when he can't seem to figure out things that I did years ago without guidance. So yeah, I care about him a lot, so much that even the smallest annoyance makes me feel guilty. It’s exhausting. Is this normal? Am I just supposed to accept that my sibling gets on my nerves sometimes but also be okay with it or do something about it?