Do we have to sin?

Time and time again I hear "Well, were human. It happens. It's going to keep happening until we get to heaven." Which sounds a lot like an excuse for me. A murder can chose not to murder; An adulterer can chose not to commit  adultery; A liar can chose not to lie; So were is the fact that we have to, because it just happens to be that way?
 It is true we all start out committing sins though we don't know them as such, but as we come to know each sin as a sin we are to stop doing it.
In John 8:11 Jesus tells a woman "Go, and sin no more." Did He just tell her to do something she is sure to fail at doing? I have heard it said "Well, He means for her not to do THAT sin anymore."
But hasn't He said through Peter in Acts 2:38, and in Acts 3:19 to repent from sins, turning to Christ so that the sin can be blotted out? Does that follow?
In 1st John 1:9 it is said "If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness." This being a confession with repentance of a broken heart turn to the Lord. Repentance isn't something to be tossed around saying "it will work here, but I'm going back to sin for this time, or this event."  Repentance is a true turning away from, making those things far from you.
Sin, like Love is a choice. Both of these are even the same choice, like as they are two sides of the same coin. Sin is a choice of self over all else... and Love is the choice of all else over self.

Answer? We don't have to sin. While it is likely we will, as it says in Matthew 26:41
"Watch and pray, that ye enter not into temptation: the spirit indeed is willing, but the flesh is weak."

God is aware of our struggles. He came and faced the same things, and did so without sinning.
"Oh, well, that GOD! I can't do that." can't you?
John 1:12-13 says  "But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God."
In the Lord's prayer of John 17 we can see His will that we be just as He was. That we be one with Him, and with the Father, just as they are one. How could one do this in a life of Sin?

"Well, if you just try really hard (to do right), God will (ignore) those little sins."
First off, "Little sins"?? There is no such thing! They are all bigger than a blue whale!
It is not about "Trying" which gives way for excuses like "Well, I tried... (kind of)."

No where in the Bible (That I know of) does it say "Well, if you try just a bit, I'll just over look everything." It says REPENT! Turn away from sin. Sin no more! These commands are to be followed. We mustn't let ignorance cause us to sin all the more. We must learn the Word of God so we know sin, so we can flee from it, and to our Heavenly Father. We must learn what we should be doing instead of the sin, so our actions can be replaced by all that is Holy. We can not do this on our own, but God through us, if we let Him.