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..