So I wrote a rough draft of my personal statement and it’s about my curiosity inside and outside of the class room. I use a specific event from preschool first and then kind of move my way along my timeline of life until present day in which I’m as curious as ever. Is this too common/ boring a topic for an essay?
there is no boring topic, only boring writing. Make sure the essay really shows your personality.
Sounds like you are curious to know if your curiosity essay is ok. 
Curiosity a quality that is highly valued in higher education. And by admissions committees. So it is always a good theme. It becomes a good essay when your examples and insights are interesting.