Peter replied, “Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins. And you will receive the gift of the Holy Spirit.
Those who accepted his message were baptized, and about three thousand were added to their number that day.
Acts 2:38,41

What shall we say, then? Shall we go on sinning so that grace may increase? By no means! We are those who have died to sin; how can we live in it any longer? Or don’t you know that all of us who were baptized into Christ Jesus were baptized into his death? We were therefore buried with him through baptism into death in order that, just as Christ was raised from the dead through the glory of the Father, we too may live a new life.
For if we have been united with him in a death like his, we will certainly also be united with him in a resurrection like his. For we know that our old self was crucified with him so that the body ruled by sin might be done away with,[a] that we should no longer be slaves to sin— because anyone who has died has been set free from sin.
Now if we died with Christ, we believe that we will also live with him. For we know that since Christ was raised from the dead, he cannot die again; death no longer has mastery over him. The death he died, he died to sin once for all; but the life he lives, he lives to God.
In the same way, count yourselves dead to sin but alive to God in Christ Jesus.
Romans 6:1-11

Bottom Line

Living in Christ requires dying to your old self.

Since, then, you have been raised with Christ, set your hearts on things above, where Christ is, seated at the right hand of God. Set your minds on things above, not on earthly things. For you died, and your life is now hidden with Christ in God. When Christ, who is your life, appears, then you also will appear with him in glory.
Put to death, therefore, whatever belongs to your earthly nature: sexual immorality, impurity, lust, evil desires and greed, which is idolatry. Because of these, the wrath of God is coming. You used to walk in these ways, in the life you once lived. But now you must also rid yourselves of all such things as these: anger, rage, malice, slander, and filthy language from your lips. Do not lie to each other, since you have taken off your old self with its practices and have put on the new self, which is being renewed in knowledge in the image of its Creator.
Colossians 3:1-10

"The Christian way is different: harder, and easier. Christ says “Give me All. I don’t want so much of your time and so much of your money and so much of your work: I want You. I have not come to torment your natural self, but to kill it. No half-measures are any good. I don’t want to cut off a branch here and a branch there, I want to have the whole tree down. Hand over the whole natural self, all the desires which you think innocent as well as the ones you think wicked - the whole outfit. I will give you a new self instead. In fact, I will give you Myself”…
The terrible thing, the almost impossible thing, is to hand over your whole self to Christ. But it is far easier than what we are trying to do instead. For what we are trying to do is to remain what we call “ourselves,” to keep personal happiness as our great aim in life, and yet at the same time be “good”…
And this is exactly what Christ warned us you could not do. As He said, a thistle cannot produce figs. If I am a field that contains nothing but grass-seed, I cannot produce wheat. Cutting the grass may keep it short: but I shall still produce grass and no wheat. If I want to produce wheat, the change must go deeper than the surface. I must be ploughed up and re-sown."
– C.S. Lewis "Mere Christianity"