"Am I that immature? Am I a brat? Am I silly?"
I guess it depends on what you are calling "I", doesn't it?
I think one would be better off refering to that entity (or those entities) as "it" rather than "I", something to be observed. Is "it" being a brat, is "it" immature, is "it" being silly?
The first freedom is the freedom from "like" and "dislike", something that I am guessing might best be approached by having an overall "aim" for one's life.
You are absolutely right!! This doesn't define who I am, it's only a side of me.. So "it" can be any either silly or immature.. :)
Regarding that "aim" for one's life, yes, we should all figure out a reason for being, our "ikigai", in order to obtain a balanced life. When you know the reason for which you wake up every morning, you know better who you are, what you like and what you don't..