Actually it can be used with second person.Shipeo is only used with first person.
Ex. Sagwa-reul meok-ko shipeo = I want to eat the apple.
Hakkyo-e-neun ga-go ship-ji anha = I don't wanna go to school.
This is correct.its 원해요 formal, 원해 informal
This is not true.Shipeo is only used with first person.