A child can not just decide and do it on their own, in home schooling your parent is your teacher and is in charge of your education.

And I will disagree with krittengirl slightly the requirements will depend on the what type of program you are taking in most cases all that is required to home school in Pennsylvania is just a high school dipolma.
Pennsylvania is one of those states where school boards have been known to lie to parents and not tell them the truth about their rights to home shchool so they give a lot of false info that people pick up.
HSLDA | Home School Laws

Also no home school children do not have to test for the GED that is just a falsehood completely, they do have to in program one sit for the 3 , 4 and 8 grade standardised testing. But in program 2 and 3 they don't even have to do that.

I don't mean to sound mean but please you may be happy to answer questions Krittengirl but provide the right answers if you do

One of your parents would have to devote a lot of time to this.