Ask HN: How do you know what you want in life?

I’ve realized over the past 2 years, I haven’t been making things that I find interesting, I’ve been making things that I desperately hope other people will find interesting.

It seems like when I look around online, everyone has their thing, a unique niche that perfectly fits them. I feel like I only have vague interests - computer science, film, a bit of english.

How do you know your life-niche?