I accidentally backed into a girl with my car
What caused you to hit the girl?
It's my dad's fault, he always gives me bad directions.
I do think that you could have been paying more attention. You can't just reverse blindly based on what someone said. You have to look yourself.
Why does everyone want to blame me? I try to be the perfect person and still get this throw at me.
It has nothing to do with blaming you, however, it is your responsibility to understand what you did incorrectly in not looking for yourself, so that you can remedy that in the future. Not looking when backing out will sometimes result in accidents. You will see this as you drive more and more every year.