Being born again doesn't mean being perfect. It simply means you've been born a second time, this time not physically but spiritually. You've been baptized into Christ by acknowledging and accepting the sacrifice of Jesus and receiving His Spirit into you. You receive a new spirit as the former spirit dies, but your body and mind still remain the same, and if you're not careful, if you don't allow your new spirit from God to gain dominion over the rest of you, its possible you would keep on living like before as if you were never born again.
