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Yes, I am 100% sure that I will go to heaven.
3. God will let all enter Heaven who ask for forgiveness from what wrongs they have done.
Many people have developed their own understanding of how to reconcile their sins with God. In doing so, they have sat in church pews all their lives and have never come to personally know God. Our common problem is that "all have sinned" and we have thus been separated from God. This being true, since it is God who has been wronged, He should be the One to determine how it is we repair our relationship with Him: He should make the way rather than us presuming we can make the way. The Bible teaches that there is no way back to God (including our asking of forgiveness alone) except through Christ.
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The Bible teaches that our lostness is rooted in the fact that we live in a fallen world in which we are all handicapped by a sin nature: "all have sinned and fall short of the glory of God" (Romans 3:23). And despite our best efforts we are unable to remove the haunting weight of guilt that separates us from our Creator. Although we may ask forgiveness, the penalty for breaking God's law remains unpaid. The wrongs we have committed against a Holy God have not been canceled and can still not be set aside. Since God is not only forgiving, but also just and fair, He must punish sin or there would be lawlessness. He would be simply overlooking wrongdoing and chaos would replace order. (Think what would happen if all criminals had to do was to ask for the judge to forgive all matters of wrongdoing without any payment or sentencing just because they asked.) God's justice demands that disobedience be punished.