It's okay to be different. It just takes a lot more effort to find people you can connect with, and it will be so worthwhile once you do. You shouldn't have to change yourself to fit in with others.
In my case, I've always been odd. I've always been too mature for my age as a child. I loved reading detective novels since the age of 8 and never really had anyone to talk to about such things. Even the sudden popularity of Holmes in my late teen years made it difficult for me to befriend people who enjoyed the modern representation of Holmes, because the Holmes that I loved in my mind was so perfect. The Holmes that people loved was not the Holmes I knew.
Regarding any forms of media I do enjoy, I tend to only recommend things for special reasons. I watch anime, but can't really discuss anime with many people unless they're willing to read essay long paragraphs of my observations to why certain elements are used, references and what kind of things have been foreshadowed. I really like enjoying things and understanding things as a whole.
These days, that isn't a side of me that shows up often due to lack of people caring or willing to discuss such things with me.
...
I lost my only close friends in my final year of high school and fell into a depressed state.
Do you know the reasons as to why you think you are childish, or why you think your reaction is naive?
I don't think thinking childishly is bad, because it stems from hope. I was too hurt by the past that I generally react to things with childlike innocence too. I'm aware that most people would think of a darker meaning, but it takes me a minute for me to see from another perspective. Maybe it's more like a defensive mechanism for me, but... all people are capable to love, be caring and be hopeful. There's nothing wrong in thinking like a child. It's just another perspective on things, and being able to accept other views would only make your understanding of things fuller.
...
These days, I'm as childish as can be. I'm 24 and love playing with my Sylvanians very much. It's something I've always loved in my childhood, but as my parents were immigrants, it wasn't something we could afford so I never asked.
Aren't they adorable?
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I don't think adulthood just happens overnight, because I'm more like a child than anything at the moment.
There's nothing wrong with being childlike, or happy over simplistic things.
I love meeting people with passion. They're very vibrant, understanding and interesting.
They care about the things they've experienced that make them who they are.
It's too boring if everyone is the same or closed off from each other.
I think it's wonderful to see people expressing the things they love, because I might be interested in it too.
Happiness should be welcomed and embraced, rather than be isolated.
... but yeah. These are the words of a rather lonely person (me), but I'm very content with my life and the connection I've made with my closest friends. I'm rather similar, but opposite to pastellrain... I'd hope for you to be able to accept that difference, but not sure if I have any right to say that ^^;