He commands you to do so. You cannot be saved without repenting of your sins, no need to try to dodge God s command if you expect to live eternally in heaven with Him. Sin kills beyond the tomb do not be as the man who pleaded for help but it was too late. Let me point you to the Lamb of God, Jesus Christ, who can take away your sin. Do not be deceived into thinking you have plenty of time to get saved.
Today is the day of salvation.
Today if ye hear His voice harden not your heart. Turn to God and repent of your sins while yet there is time. Likewise, I say unto you there is joy in the presence of the angels of God over one sinner that repenteth.