It may not be "normal" necessarily, but the idea that you may be trying to capture that childhood could explain it.

I'm 20 and I actually shop in young boys and juniors clothes. I prefer being called a "demiboy" rather than a guy or man. I think it's cus we are still kinda young, and not fully out of the idea of being teens (I know I don't feel any different mentally now than I did when I was 17 except less depressed tbh), we don't quite view ourselves as full adults? (This is all speculation).

Perhaps it's just a style thing? Maybe those things just appeal to you more. I mean clothes don't have age or gender restrictions technically speaking. I dunno, just throwin some stuff out there.