(((little))) I'm sorry you are so upset. I know how it is to feel like a failure... In school I flunked algebra...but it wasn't really my "fault"...it was because the previous math teacher didn't believe me when I told her I didn't know what I was doing

so she advanced me anyway

Of course it affected me (Hey, I'm still talking about it!) But it wasn't the end of the world....
I think your grades are indicative of how you feel inside

that's what is most important, to me. I hope you can get that across to your folks (((hugs)))