Write something that you're inspired to do.
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Most of you probably know this already, but I really want to become a professional singer when I grow up, which is why I am writing songs right now so I can start singing in high school. I'm going to post my videos/songs on YouTube and try to get big, using a professional camera and editing-app. Then, once I get famous enough, I'll try to find a local radio to play my my music. If that's a hit, and I'll try to become an actor.
Being a writer. Not even a famous one, but at least a published writer. I've always had a vivid imagination and I've always been writing small stories and fanfiction and would like to try and get a book written.
I know it's childish but I've always wanted to be a race car driver for some team and still haven't given up