I'm really afraid to go home because I've been hiding my poor grades from my parents
Is it really that bad? Why do you have to hide it?
Because they would be so disappointed if I let them know that I've been failing math this year. I just want my parents to be proud of me.
It is okay to be scared about disappointing your parents but it is not good to lie to them. They will feel betrayed and they will not trust you anymore.
I know it will be painful for them but I will break the news to them in my own way
I'm glad you chose not to lie about it, and your parents will be proud that you are upfront with them. I believe they would love you no matter what, and being honest will make them love you even more! I'm sure they'd want to help you out, like hiring a tutor.