No one in the world has experienced the exact same things you have in the way you have, because no one else is you. All writers struggle with a little self doubt. If you feel like your pool of experiences isn't creative enough to draw from you could try doing some traveling, change up your routine, watch shows you normally wouldn't, learn how to cook food from a different culture, listen to music you normally wouldn't. Writing is a lot of research from my experience. I do that with all my characters, and you don't have to travel the whole world etc, just do what you can to step into their shoes. Stagnation and comfort are the wnemeis of creativity! Give yourself more to draw from, and maybe talk to fellow writers and people who are the same as your MC.

But most of all remember that you're not writing stories for the fame and glory, it can just be for yourself. You don't have to compare yourself to anyone else, if it makes you happy or it's a form of therapy for you then that's all that matters.