AFS programmes i guess :)
There are several resources that can help you figure out which programs to apply to and how. First is our program search tool. You can click "Non-U.S. citizen" and then see which programs you are eligible for. Given your age and country of origin I believe the YES program is a fit. See the YES site for Egpyt for contact information about the program. Furthermore, I would suggest you join the YES discussion group and ask this question to those members as well. Past and current participants may be able to help you even more. Let me know if you have any more questions!
I would second all of Imani's suggestions - that is the best way to find an exchange program to go to the USA. There's also a discussion going on about just this topic over at this discussion page. Check it out and let me know what you think!