I'm the oldest but act like the baby sometimes

So I'm the eldest of three and technically the responsible one. But lately, I've been caught sneaking into my little brother's room to hide in his closet when he's asleep. It's this weird comfort thing, being in there feels safe for some reason. Last week, he came home late from a friend's house with some new video game he was super excited about. The next day, I snuck in there again and started playing it without telling him. He found out when my sister told on me because she thought I had actually borrowed the game properly! Now I feel like such a kid for hiding stuff like that, but honestly, if you could crawl into a closet and be six years younger for an hour or two, wouldn't you?