I have a similar problem. I am by no means a master at brainstorming examples, and I, too, feel that I have not too many experiences to use.
what has helped me is to just write about topics and subjects that are important to me.
If it fits and I can explain how it relates to the prompt, then who cares if it is a relatively uncommon example! The more uncommon I think the better because it will catch the reader's attention after reading 200-500 essays on Abraham Lincoln or how medicine has irradiated polio.
You have lived alot of life up to this point. Trust your experiences to be enough to answer this essay.