Welcome, Megan! I hope you have a good time here on Steemit. I'd only encourage you to do one thing - write!
Try out all sorts of things on and off here, enter contests, even if they don't sound like your usual stuff ;) It's how you learn about yourself!

As for writing online or posting your writing, this is my first experience of doing it and Steemit has done wonders for me as a young writer. It's helped me gain so much confidence that others liked my writing. And I think it s a step in the right direction. After all, it kinda misses the point if no one sees your stories, I think. Also, there's the chance to get rewarded for your words which is incredible, to me. So, write, write, write!

And once again, welcome :)