For me, I'm open about my love for toys/dolls. It's just like any other hobby such as playing video games, collecting and reading books/comics, watching movies/tv shows, buying clothes, cars, going to events, buying sports related stuff, and more. It's fun, it makes use of a person's imagination, and it makes me happy.
I think that the notion that toys/dolls are just for little children stems from the old days when toys or dolls were very simplistic that they were very easy to let go of when told to do so by older people to "grow up" and prepare children/teens into becoming adults who have to now use all their money to pay taxes, buy food and other survival necessities. Another factor could be that a lot of people these days don't understand just how AWESOME modern toys and dolls have become and when you mention toys and dolls, old crappy toys immediately spring into their mind.
From my personal experience as a kid of the 80s, I remember having a LOT of toys like the classic DC Superheroes, GI Joes, Ninja Turtles, Silverhawks, Dragon Ball, Godzilla, and more. I did love playing around with them just like a kid would (make Superman hit Lex Luthor by bashing them together and then make Lex Luthor crash into the ground... which is made of flour that I used often to bake failed cookies). I was never told by my parents to "give up" the toys, but I honestly lost interest in them because video games took over as my main hobby. I still kept them (and I still do have them!) but they're just safely stored in baskets/boxes.
I didn't buy toys for a long time because I also thought that they were still the same old little 3 to 4 inch toys that barely moved, never really looked like who they're supposed to represent, and I also remembered that their quality could be flimsy. Around twenty years later after the last time I bought toys, I was curious about what modern day toys looked like and how much different they've become from the ones I used to love. I researched about new Godzilla toys and I was amazed by what I discovered! Modern day technology has made it possible for toy makers to create highly detailed creations without sacrificing the posability of toys! The excitement led me into researching about modern day dolls, and that's how I stumbled upon Phicen/TBLeague! I was totally shocked by how realistic they looked, it was like something I wished for as a kid but have forgotten and suddenly it became a reality!
As for creating little stories, it's not just for little children. Being able to come up with stories using only toys and dolls is a sign of a very creative mind. There is nothing wrong with it and it is actually very valuable, especially in the fields of entertainment. Books and movies are made of little stories that come from a person's mind! Without the ability to create stories, it'll be a very boring world. One of the challenges or exercises whether you have to write a story for a book, movie, video game, or even if you have to write music, is to create something out of a limited set of options. Being able to flesh out an entire world or lore with just a few things is what makes the mind expand and capable of producing even more creative stuff! Keeping your mind active by making up stories is also good for one's mental health as it exercises the mind to not remain stagnant.
Personally, I think if people looked and tried playing around with modern day toys, it would make them understand why a lot of adults love them especially now. In the end, if toys and dolls make you happy, then go for it! It's your money and you're not harming anyone
Imperial Godzilla 1985 Version (1985)
Modern Day Monsterarts Godzilla 2002 Version (2018)
Goku Super Battle Collection (1991)
Figuarts Goku (2018)