Congratulations on finding an excellent question to study. Have you examined the Science Buddies Science Fair Project Guide pages relating to the requirements and regulations for your study? If not, here is a link:http://www.sciencebuddies.org/science-f ... ects.shtml
How do you find a qualified mentor? I would start by considering your local school staff/faculty. Is there a guidance counselor, a college application advisor, or a psychology teacher who might help? Failing that try a local college dean of admissions or professor of psychology, or the same positions at the college you are thinking of attending. All these folks might have a real interest in knowing the results of your study if you do a good competent job of it.
As far as questions about your local IRB go, your teacher should be able to help you find the answers.
If possible find your qualified mentor first. They, or your teacher, should be able to advise you (if they are a good mentor) on how you might conduct the experiment while complying with the rules.
You can study the links above to see the ISEF rules. I believe that you must have an appropriate informed consent form completed before collecting any data from any participant, and it may be required to get the informed consent from the parent or guardian as well if your subjects are minors.
I think your topic is an excellent one, likely to be of great interest to a great many people if it is done well. If it turns out well you might even consider trying to get it published. I wish you every success with it.