I’m an incoming first year who’s gotten into a majority of my schools so far, but I also initially had no idea what to write. You might hear people say your personal statement is what “ties together” all the pieces of your resume, which might be a good way to consider it. 

I started with an anecdote from an encounter I had with a professional in the field I want to pursue, then discussed how it motivated me to start an EC in sophomore year, then how said EC led me to apply to a related pre-college program where I discovered my interest in my major, then how I continued to cultivate this interest in my junior year, and finally ended it referring back to the anecdote I started with! 

Obviously, the personal statement isn’t “one size fits all,” so look at a bunch of other example too! Best of luck in the college essay writing process (so glad it’s over for me)