Now that you are saved there is a change inside of you, the world may not know it but you are a new creation. The old sinful nature has been put to death, crucified with Christ.
Romans 6:3-5 says, "Know ye not, that so many of us as were baptized into Jesus Christ were baptized into his death? Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life. For if we have been planted together in the likeness of his death, we shall be also in the likeness of his resurrection:"
And so we find a picture in baptism. Just as we have died and raised again spiritually, we make a show of this physically in baptism. It is a visual and symbolic demonstration of a person’s faith in Jesus Christ. It signifies that the former way of life has been put to death and depicts the raising up of a new life committed to following Christ.