If you say you don't need Him, then you believe He exists. If you do, why would you say you don't need Him? Isn't He the One who determines your destiny? Doesn't He have the authority and power to do as He pleases and to send you to Heaven or Hell? It is foolish to say you don't need the One who is your Creator, who loves you and has provided the way for forgiveness of sin. You need God because only He can cleanse you from your sins.
What do you need? Are you really doing that well without God? Are you happy with the way things are in your life? If you aren't, then you need Jesus. And even if you are happy, you still need Him, because you can't take what makes you happy with you when you die.
How could you not need God? I mean, isn't he the creator? How could you not need the one who is good, loving, kind, and has all power to work those in your life?