We can't use Jesus to justify our sin. You may say "I'm not Jesus. I'm going to sin, I can't help it."
That's entirely true. We aren't Jesus and can't help sinning. Still though, that doesn't give us an excuse to sin. We were once slaves to sin, with no hope of getting better. (John 8:34)
But Jesus set us free from this, and through him we can find the power to fight off our sin and live for God. (Romans 6:6-7, Romans 6:12, Romans 6:14)
But wait. If we're all set free, how come we fail so often?
".. The spirit is willing but the body is weak." (Matthew 26:41)
We all know how to stop our sin, but we choose no to.
We know this sin is empty, but we continue to chase it anyway.
We're so attached to our sin that we don't wanna let it go. We don't want to give it to God, because we know he'll get rid of it. We still cling to it, even after repenting and trying to start fresh. We are addicts of our sin.
Through that is how Satan chains and binds us. While we're too busy trying to please ourselves, he comes in, and feeds us more and more. But it will never be enough. It will never satisfy.
But we keep chasing it to the grave, wasting our entire lives, thwarting the plans God has for us, and giving nothing to the God who gave everything for us.
Is that how we should live? That's exactly what Christ came to set us FREE from. But we still allow ourselves to fall back into it.
2 Peter 2:20-21 says "If they have escaped the corruption of the world by knowing our Lord and Savior Jesus Christ and are again entangled in it and are overcome, they are worse off at the end than they were at the beginning.  It would have been better for them not to have known the way of righteousness, than to have known it and then to turn their backs on the sacred command that was passed on to them." (NIV)
Harsh words..but they're true words. And we should be thankful to have a God that loves us enough to be completely honest, and not hold anything back.
But yes, we need change. We can't let Satan work us like puppets, with his twisted fingers all up inside us. Jesus isn't an excuse for our sin, he is the way out.
This is where your soul comes in (along with your mind, heart, and strength, but I'm focusing on the soul). We need to get our souls lined up with God.
We need to follow his lead instead of making our own path. God knows what's best. If he says something is bad, it's for a good reason.
We can't see ahead like he can, and we don't have the wisdom to always know what's going to help or hurt us. So sometimes we just need to trust God, and do what he says.
So no, Jesus doesn't give us an excuse to sin. He gives us hope to overcome it.
All authority has been given to Jesus,(Matthew 28:18) and there's nothing that he cannot do.(Matthew 19:26)
We just have to acknowledge that we are in the wrong, and trust in him to bring us into the light. :)
Have a great day and God bless!!