Are you involved in any extracurricular activities? I wrote about being content in my school’s Little Theatre where I discovered acting, music, and many different friendships. This was my junior year. I’m not sure I would have had any significant experiences to write about my freshman and sophomore year. Maybe you do. I agree with ilovethecity; you should wait at least until the summer between junior and senior year to start working on your essays.
I consider myself “privileged;” I’m a middle-class white male. I’m gay but I haven’t really faced any adversity because of that. I believe I still wrote a compelling essay, even if it wasn’t about a hardship I’ve faced.