Pick out some local companies you would be interested in working as an intern at? Stop by see if you can get a tour, make connections, inquire if they have an internship program.

Most fun/tech companies love helping kids. We coach a lego robotics team and have gotten lots of tours, demos and even a meeting space for our team at a local startup.

All by calling, stopping by, following up and asking politely.

An internship would be a little different, but if you get to know people at a company it makes it much easier.