No, of course not. Think of the thief on the cross…he wasn’t baptized with water but he had faith in Jesus and was saved that day. People are told the Good News, have faith in God, and ask to be baptized. It doesn’t mean that you have no faith before being baptized. You, as an adult, are asking to be baptized because you have faith. Baptism will wash away your sin, add you to the Body of the Church, and confer special graces on you. As you look forward to your baptism, you can be increasing your faith and knowledge and trust in God through study and prayer and attending Mass.