First, make sure you & the parent are willing to accept the responsibility & duty that this demands. You will need to figure out what your state/school district law requires of the parent who will be teaching you. Here are a couple links to get you started.
This is a nice, ‘how-to’ that explains the process in simple steps.
This is the site for just about every thing you need to know.
Have you parents look through this information, for this choice ultimately depends on them. But before any of this – give school a chance. Ask teachers for help. Seek out tutors. Stay after school, even for just an hour & do your homework there. That way, if you need help – the teachers will be there. (Not sure if that applies to all schools. In my district, teachers usually stayed for hours after school let out.) If teachers see that you are willing to make the effort & put in the time, they may be likely to do the same. Best of luck. & remember, be cool – stay in school. :)