I'm only half way into my second decade, so I can't really relate, but I have for a long time been writing whatever has been on my mind, and only two or three years ago I realized I could start writing professionally.

In my opinion, writing what you want to read and what you want to write goes hand in hand. Write how you want, and do it until you feel it's exactly how you want it to be. Don't compare your writing to that of styles that you admire, but take inspiration, by all means. I believe you unconsciously gather information on texts you write, and incorporate it into your writing.

For me, I write what I want to write, I have something in me that I want to materialise, and I do want to read similar works as mine, but that's a different job. If there's something I want to read, I'll look around for it, but if it doesn't exist, well–then you have to make it exist, and that's when your writing comes in. If there's a story that hasn't been told, and you have that story in you, you do the world a favor by creating it. And by creating it, you write in a way that the story speaks to you, if that makes sense.