I'm an author (as yet unpublished, though I've tried to get an agent). I stopped studying the English language and its literature formally when I was 16, which was the youngest age you could do that where I live. However, I thought I might get paid for writing fiction one day, so I kept reading and writing for my own enjoyment, slowly getting better at both.
I subsequently went to university and got a bachelor's degree in computer science. I don't think I would've been much worse as a writer had I not gone there, though I did get the opportunity to write some plays for the university's radio station.
You can do a degree in creative writing, but I don't think this is necessary if you want to make a career as a novelist. Those courses didn't exist when I was at university. I don't feel that not having that qualification has held me back as a writer. What's helped as much or more is being in a critique group with other writers who are better than me.
Tip: if you claim to be good at writing, show us that you know where capital letters and apostrophes belong. Don't make excuses about "it's faster without them" or "it's only an ephemeral message" or "that's what editors are for." These things are tools of the writer's craft, and you should take every opportunity to keep them sharp.