12 Just as a body, though one, has many parts, but all its many parts form one body, so it is with Christ. 13 For we were all baptized by one Spirit so as to form one body—whether Jews or Gentiles, slave or free—and we were all given the one Spirit to drink.
"'Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all things that I have commanded you; and lo, I am with you always, even to the end of the age.' Amen" (Matthew 28:19, 20, NKJV).
Some teenagers, having been baptized younger, feel that they might not have understood "everything" they understand now. That is true in the sense that as a teen you don't understand as much as you will in college. And when you become a parent, you will find that you know more than you did when you were younger. We should always be learning and growing.
Life as a child of God is a journey. Baptism is an important part of that journey, and it needs to be the result of a thoughtful decision. Faith in the grace of God and promise of His power to save you is the beginning. And each day from there on is another opportunity to learn and grow in Christ.
Your baptism may be (or may have been) on a perfect day. Your favorite pastor may have been able to baptize you. Yet that is not what matters most. As you continue to grow older you will find challenges that will remind you that you need to surrender to God every day. Seize each moment to recommit your heart to Christ as Lord and Savior, and your baptism will become more and more meaningful as you grow and mature.