I was baptized as a baby, but that isn't even scriptual. I really did not understand baptism the first time when I was actually dunked in a pond that was being used for baptizing. When I came up from the water all I was was wet and everyone was welcoming me into the family. I knew nothing about being Spiritually reborn again or even understood anything about the Holy Spirit.
It wasn't until many years later that I learned about the Spiritual rebirth and the indwelling of the Holy Spirit. While sitting in church as the Pastor was teaching on the Holy Spirit and salvation. There was an altar call after to whoever wanted the indwelling of the Holy Spirit and I went forward. That is when Christ indwelled me and opened my Spiritual eyes and ears to understand and no one had to lay any hands on me as the calling was from Christ and not man.
I felt led to be water baptized again with a better understanding as even though I still came up wet the experience had more meaning as it drew me back to Christ when John baptized Him as the need for Jesus to be baptized by John was to relate His relationship with humanity as He started His ministry as Christ had no sin to repent of. There needs to be a greater teaching on salvation and the indwelling of the Holy Spirit, but many churches will not teach this.