How Can I stop sinning?

 Therefore, since we are surrounded by so great a cloud of witnesses, let us also lay aside every weight, and sin which clings so closely, and let us run with endurance the race that is set before us, looking to Jesus, the founder and perfecter of our faith.

Hebrews 12:1-2

All humans sin. God knew when He created us that we would not be perfect. Since the original sin in the Garden, we're all born with an inclination to sin; and even with our best intentions we still sin. The cross was not an afterthought—God knew that we had no way to correct this problem. (Job 14:4) Only God has the authority to forgive sins. God loves us so much that he sent Jesus, his only son, to walk the earth and make the perfect sacrifice so that we can be forgiven of our sins. Jesus had the power to overcome death and rise from the grave. That same power can defeat the sins that keep defeating us. By giving our lives to Jesus, and granting him all power over us, we are given victory over our sin.

Admit our sins

“If we claim that we’re free of sin, we’re only fooling ourselves. A claim like that is errant nonsense. On the other hand, if we admit our sins—make a clean breast of them—he won’t let us down; he’ll be true to himself. He’ll forgive our sins and purge us of all wrongdoing. If we claim that we’ve never sinned, we out-and-out contradict God—make a liar out of him. A claim like that only shows off our ignorance of God.” (1 John 1:8-10, MSG)