Is there a name for the condition when adults still think like children?

Interesting question: While one is inclined to automatically think it's just "immaturity", this could be other things. Perhaps, there's a condition in which one is unable to face growing up, responsibilities, etc. Some have a form of pervasive developmental delay/autism that may manifest as odd or eccentric behavior. I recommend a full eval by a doc to see what's in order, and in the meantime, hang in there!