How do we know for certain there’s heaven?

I’m a member of the LDS church and everyone who’s a member of the LDS church says that it’s the true church, well come to realize it, Catholics would say the same thing about their church as well as Lutherans, Protestants etc. Either there’s one true church or worse, I’m beginning to think there is no true church and that this is all just what we think. I’m afraid of the possibility that heaven is just one of those made up things, like unicorns, dragons, fairys etc. One of my biggest fears I’ve been having is the possibility that people die and there being nothing after death, it’ll be like before you were born, because what do you remember before you were born? And come to realize it, how would we have a mind of our own in heaven? There’s a reason heaven is called a better place, and I hope it really does exist, how do we know for sure heaven exists?

How do we know for certain there’s heaven?
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