Nope. It’s normal to get attached to things. My fiance (37f) has all kinds of stuff from her childhood that she still uses, even if only occasionally. Blanket, shirts, Xmas ornaments, the list goes on. For her, in her own words, the attachment is to the memories associated with the things, like Xmas or a school club or college. She’s got a lot of things, not just over blanket, but it’s the same principle. Perfectly reasonable and normal.