No, you're not going to Hell. I'm so sorry they did this and didn't tell you. God knows your heart, and he knows you wouldn't have made that decision. Even if you had, you could ask for forgiveness. Romans 3:23 says all have sinned, and fallen short of the glory of God. When Jesus died on the cross, he paid for the price for our sins, evcen the worst of them. All you have to do is accept Him, and repent.