Getting an internship at 13 can be difficult, but not impossible. Here's my advice from my experience coming to NYC for an internship while in HS:

- Try your hardest, and don't let anyone tell you you can't.

- Figure out if there are any employment laws that could affect you working somewhere.

- Don't tell people how old you are, until it's absolutely necessary (legally), let them judge you on your skillset and portfolio

- Ignore their requirements. Apply and ask for the position anyways!