If you have no professional references, it's suggested that you use character references. They include those who have worked with you on a large project as part of your team, or something who you volunteered under. Girls Scouts isn't a bad idea, if you still know the person that was in charge of your uhh... team(?). It still counts no matter how long ago, as long as you keep a relationship with that person and they can attest to both your personal and professional personalities.
If you are trying to find a job, pick up a small volunteer job while you are looking. Although most people prefer that you know your reference for a year or more, you can ask to help your aunt's friend or neighbour etc with some small yard work. Therefore they know you, and you've worked for them.
Oh and one last thing, if you have no previous employment, make sure you plump up your resume with volunteer experiences, high school awards/clubs/committees and anything that you can think of that indicates that you are a strong leader and communicator. Depending on the job, talk up customer service, cash/math skills or leadership skills. Don't forget to research the company/place extensively and string it into your interview somehow, that has gotten me so many callbacks I never go without some research. And don't be afraid to do follow-ups, (most) people love follow-ups.
Okay, I said the last thing was the last thing but I have to mention that your age alone will get you more interviews than someone who is fourteen. Don't worry about not having experience, managers can look for that as then they can mold you to whatever their company needs as opposed to having to force you to forget a certain set of skills before learning theirs. Once I hit college, my interviews quadrupled, so don't worry.
I hope that has helped. I've held down way too many jobs. :S Pick one that you love and remember never to work too much. Don't turn into a workaholic like me.