I think it's absolutely great that you're seriously considering writing as a career. I've been a writer for many years now, mostly in the high-tech field as a technical writer. The world of writing has been hugely impacted by the arrival of the Internet and the wide availability of computers and mobile devices.
Your plan to major in English literature seems like a good one. You'll have to do a lot of reading (a very good thing for serious writers to do), and a lot of writing. Writing is a craft as much as an art (or even more so). As craft or art, it requires much practice (write, write, write, then write some more), but also an attentiveness to what good writing is. That second part is where reading a lot, and reading criticism, too, is important. By "criticism" I don't mean put-downs and such, I mean analysis of writing.
Most importantly, since you plan on being a published writer, don't wait for anything to start writing and publishing now (see Next Steps).
Igal recommends the following next steps:
- Read a lot of the type of writing you want to write, and criticism of that writing.
- Find some like-minded people who are willing to edit your work, in exchange for you editing theirs. Doesn't have to be a writing group, per se, because people can do this over the Internet.
- Get a free account on Medium (must be 13 or older) or similar blogging site and start putting your writing out there!