I think you are missing some key text from the prompt. I searched the exact text you did include, and found a prompt posted elsewhere that seems to match. It might not be the exact full prompt you were given, but please read yours carefully.
Here's the text I found posted by another applicant here... Bold is added by me.
Applicants for our graduate programs are selected using a holistic evaluation system. This essay will assist both the admissions committee and fellowship review committees to evaluate your background and motivation for graduate study. In your personal history statement, please describe how your personal background informs your decision to pursue a graduate degree. A sample of topics that you might address in your statement is below. However, please structure your statement in any way that you feel best represents your personal history. Please do note that there is a 1200 word maximum for the statement.
Any educational, familial, cultural, economic or social experiences or opportunities relevant to your academic journey
Challenges and/or obligations you have had to address in order to achieve your educational goals and how you addressed them
Employment while an undergraduate
How your perspectives or activities contribute to social or cultural diversity and/or make you sensitive to the experiences of underrepresented groups
You are not meant to address all four bullet points, but rather address a suitable topic that is relevant to your own life experiences. Different people are going to have different types of answers to a broad question like this - that's kind of the point.
I dug up one of my own statements from applying to grad schools over a decade ago, and although I don't have the exact prompt I was responding to, it looks like what I wrote would have fallen best under the first and third bullet points here.
I wrote about a job I had as an undergrad in which a big part of my role was in bringing biology to engineers, wrote about the challenges and benefits in working with experts having different knowledge and skill sets, and how I benefited from (and enjoyed) being in the middle.
I also wrote about a subject that I minored in as an undergraduate (the history of science and technology), that I thought would be uncommon among other applicants, and how I thought those perspectives were important to the practice of modern science.
I think for these statements the answers should show that you are thoughtful and have some ability to measure your own perspective; they aren't meant to check some magic "diversity box" that only certain people are qualified for.