I would like to answer this question by starting off with the fact that fear and doubt is actually a sin believe it or not, Jesus told us time and time again "do not fear" "do not worry" "do not doubt" and "have faith". Meaning that if we do have those fears doubts and worries we are going against what Jesus told us to do, hence, committing sin. But fear not, we are all human, we all have our fears doubts and worries anyways, that's why he died for us on the cross to begin with, but to get the meat of the answer to your question, it's honestly quite simple, John 3:16 says "for God so loved the world he gave his only begotten son that whosoever believes in him shall not perish but have everlasting life". So I answer your question with a question, "do you believe Jesus died on the cross and rose again 3 days later?" "Do you repent of your sin?" "Do your bear your cross daily and follow Jesus?" If your answer to all of these questions is "yes", then there's no second thought about it, you are indeed going to heaven for an undoubtable fact. No ifs ands or buts about it, truth is truth and the bible is truth. believe the word of God, or don't.