Every one of us has experience. All our experiences will be unique and different, although there will be a common thread in situations that most of us are familiar with: weddings, births, shopping, eating etc, how we view the world and what happens to us in our world will be similar, but no-one can truly know how someone else feels or what they perceive from the world as we have our own unique view.
So what has this got to do with writing? Well, we are always being advised to write what we know - this is great advice as an expert in your own field you are the best person to write about it. You live it so you know it. But someone else writing about the same topic who is also an expert in that field will write a totally different article to you. It's all down to individual view point and life experience. So don't think that because there are hundreds, possibly thousands of people who could write about what you want to write about that there is no point in you bothering - there is - editors want your unique view point.
You don't even have to restrict it to writing about what you know. Writing about something you don't know much about will broaden your writing repertoire as well as giving you new interests and refining your research skills. So next time you're deliberating about what to write about, think about your unique life experience, find a common thread to resonate with readers and use your individual insight to make it come alive.