Your high school guidance department would probably be the place that has information about internships and as long as you’re not out of high school yet, try talking to your guidance counselor about it. It may be that since you won’t be a student while you want to have the internship, the school won’t be able to be of formal help to you, but there is probably someone that the counselors know who is helpful with young people and cares about their future. You could also talk to a teacher in the subject area you’re interested in–the shop teacher for manual or technical skills, the computer teacher for IT type work, the English teacher for language-associated skills. I would think you would be considered quite a bonus to an organization who has a lot of work for people to do, but not a lot of money to pay them with. Another idea would be to contact the school you’ll attend for college, if that is your plan, and see what they can do.

Other than that, try the professional association for the type of work you’d like to learn about.

Good luck to you.