I'm a writer. I like to say "screenwriter" but the truth is that I basically do every type of writing that pays and my more creative pursuits like screenwriting are generally done independently and within a circle of creative friends. You won't see my name credited on any available films or shows, basically. Still hoping that changes, obviously, that's the dream.
I learned a long time ago that doing something gives you the right to claim the title, though. If you say you want to be a director, grab some friends and direct something. If only three people see it, fuck it, you did that! You're a director and nobody can take that from you, that's why I feel comfortable saying that I am a screenwriter.
As for the most "interesting" aspect of my work, it's always fun to explain to people that I can basically pick up a project, no matter what it is or who it's for, complete it, get paid, and move on. I don't need to be tied down to a single business, publication or studio, I can essentially pick and choose what I want to do on a freelance basis and make a sufficient living. The real beauty of it all is that writing will never go out of style. Everyone needs writers and they'll pay handsomely for timely, quality work. It's one of those careers that is essentially eternal, recession-proof and you get to dabble in so many different fields and markets, making connections, constantly learning and improving with every gig.
Writing has always been like a security blanket for me. I've poured my heart out into journals, crafted stories that mean the world to me, brought characters to life that have lived in my head for years and that's just what I get to do for fun. When we talk about work, I've done just about everything under the sun and I personally gain something from every last job. It's truly a blessing.