Simon is correct, IMHO. There's only one mediator and it isn't a human. Also, if you "sin" against someone, you are supposed to go to that person and ask forgiveness before asking God directly for forgiveness, not some un involved human 3rd party.
Confessional is an irrelevant non Biblical farse created by the very Europeans who created differing classes of Christian adherents from their pagan Roman and Greek customs.
Jews don't confess their sins to any man. Jesus & the Apostles were Jews.