My answer is: kinda.
I don't have a little personality, I don't like to pretend I'm a toddler, etc. I just like to be innocent. I like innocent things, I like talking about video-games, science, nature. I'm super interested in topics like "why the ocean is salty" and "how x works". I like nature and animals. I like being nice and I like some cute things.
Unfortunately for me, I live in a heavily sensual and mischievous culture. Everyone wants to act tough,be manly, individual. People talk about sex as it if is the ultimate goal in life, the more the better. I simply cannot identify with this culture. I feel so out of place everywhere, as if I don't understand what an adult is suppose to like and talk about.
As many other individuals with ASD are reporting, life outside your house is a game of play pretend that you are interest in the things other people are. It's like the ASD brain has this child-like innocence and curiosity that doesn't go away as you grow up. You are just a "child" that now works and it's independent.
I'm not immature by any means. I work, bought a house with my money, do the dishes, pay the bills, know how to work around unexpected situations, and over the years I gave many life advice to others.
I would love to live, or at lest frequent, a place where people are as innocent as me, not because they are naive, but because they feel like it. It's almost impossible to find where I live. In this sense I feel like, yes, my "little" personality is my true self.