Joseph,
You will need to contact a guidance counselor at your school and discuss the situation with him/her.  Rules vary from district to district, so your counselor would be the best person to assist you.  Afterall, that's what counselors are for.  Good luck.

Joseph,
You feel failing 8th grade is an embarrassment and feel highly motivated to continue your education and find success. Good for you! Night school is an option. Many areas also have alternative schools that support student success in a number of ways. You may have to complete some of your 8th grade classes or all of them depending on state requirements. Don't be discouraged. You are doing the right thing for yourself. Failure is a learning experience that can help us to realize our full potential. Focus on what you want in the future-- to graduate from high school with your class. That may mean catching up in the next one or two through summer school and tutoring.

A school counselor is your best resource. Contact your middle school or high school counselor and see what choices you have. At age 14, you are not behind yet but the longer you put this off the more frustrated you may become. Hang in there and ask for assistance!