Oversaturated market fear

I hope I'm not the only one but I've been having so much anxiety and restrictive mindset from feeling like everything I wanna do is saturated.

I'm in business school and I genuinely like creating projects but I feel like everyone these days create their marketing agency and create businesses. I also love books and would like to talk about it, but I feel like everyone has an Instagram about books.

I function a lot with data and study observertion and it always say that stuff I wanna do is the most competitive. I feel like it's very fear mongering for me and i'd love to know if someone has some kind of information about the saturation that could ease my mind or if people feel the same way I do.