We all ask soul searching questions in our quest for truth. These questions of the soul can be answered with a study of The Book of Mormon. When asking “Why do I need to be baptized?” reference these scriptures:
"And he commandeth all men that they must repent, and be baptized in his name, having perfect faith in the Holy One of Israel, or they cannot be saved in the kingdom of God," (2 Nephi 9:23)
“And now, if the Lamb of God, he being holy, should have need to be baptized by water, to fulfil all righteousness, O then, how much more need have we, being unholy, to be baptized, yea, even by water!” (2 Nephi 31:5)
"Now I say unto you that ye must repent, and be born again; for the Spirit saith if ye are not born again ye cannot inherit the kingdom of heaven; therefore come and be baptized unto repentance, that ye may be washed from your sins, that ye may have faith on the Lamb of God, who taketh away the sins of the world, who is mighty to save and to cleanse from all unrighteousness.
Yea, I say unto you come and fear not, and lay aside every sin, which easily doth beset you, which doth bind you down to destruction, yea, come and go forth, and show unto your God that ye are willing to repent of your sins and enter into a covenant with him to keep his commandments, and witness it unto him this day by going into the waters of baptism.
And whosoever doeth this, and keepeth the commandments of God from thenceforth, the same will remember that I say unto him, yea, he will remember that I have said unto him, he shall have eternal life, according to the testimony of the Holy Spirit, which testifieth in me,” (Alma 7:14-16)
"Now this is the commandment: Repent, all ye ends of the earth, and come unto me and be baptized in my name, that ye may be sanctified by the reception of the Holy Ghost, that ye may stand spotless before me at the last day," (3 Npehi 27:20)