Anyway, I wanted to take this moment to say:
Don't let folks discourage you from continuing to work on something because you haven't finished it, or from starting something new because you didn't finish an old thing.
Keep track of the things that you've worked on or are working on, revisit them sometimes. Often, you'll find that things you were not able to finish at 25 you're more than capable of finishing at 30 (or insert ages here as appropriate.)