You're not
evil...only the devil is pure evil. Yes, we do evil things, but that doesn't make us evil. The fact that you've noticed your lack of conscience is a step in the right direction to setting things straight. Perhaps if you spoke with a pastor or priest, he could help you by giving you guidance.
And above all, if you want to be forgiven and return to your normal state of being, just tell God that you're sorry and want to be forgiven. Even if you don't feel contrition, try your hardest to mean what you're saying. Repeat as often as it takes to reach the point where you truly mean what you are saying. And always remember that God loves you no matter what you do, and He's always waiting for you to come back to Him, where He stands with arms outstreched.
RESPECT THE UNBORN AND CHOOSE LIFE...your mother did.
"Do not underestimate the power of the muffin! The muffin will smite all those who question it! The muffin will crush all nay-sayers! He who controls the muffin shall control the entire world!" -Taishi, Comic Party English Dub