My advice for aspiring writers is NEVER give up. People may read your work and tell you that's is a pile of rubbish, but keep on writing. The more you write, the more your talent grows, and the more your talent grows, the better your writing becomes. Sometimes you might get discouraged or tired, but never quit. There are so many books out there waiting to be written. Could you imagine if J.K. Rowling just gave up? What if Hogwarts were just stashed away in the bottom of a drawer? I don't know about you, but my life would be a lot more dull without Harry Potter.
Take inspiration from everything around you and write about it!