Why is it so hard to get to heaven?

If it's too hard then something is wrong because God said His commandments are not burdensome, maybe you have fallen on to man's commandments which are many, it all depends on whom your following if it's hard or not, just let love guide you, love yourself and your neighbor as thyself which is the greatest commandment of loving the Lord thy God with all your being, then love thy neighbor as thyself, what's so hard about this? you have a problem with loving yourself? or is it you have a problem of loving your neighbor as yourself? a hard life is unavoidable and has nothing to do with getting into heaven but because your addressing getting into heaven I can only say put these two commandments over everything else you hear and I can promise you there will be nothing that will cause you to fall IF your following Jesus, now IF your following man or men then I would have to agree with you, of ALL the things men teach that is the way to heaven, your path to paradise is going to be extremely hard, your not to love yourself MORE than your neighbor and your not to love your neighbor MORE than yourself, sometimes knowing the opposite helps, it would be better if you explained what you mean rather than generalize a question, you could get hundreds of answers that differ.

But how does a person know that he or she has been invited to go to heaven? Notice what Paul said to the anointed brothers in Rome, who were “called to be holy ones.” He told them: “You did not receive a spirit of slavery causing fear again, but you received a spirit of adoption as sons, by which spirit we cry out: ‘Abba, Father!’ The spirit itself bears witness with our spirit that we are God’s children.” (Romans 1:7; 8:15, 16) By means of his holy spirit, God makes it clear to someone that he or she is invited to rule as a king in heaven with Jesus.​—1 Thessalonians 2:12.

Not hard at all as long as you accept Jesus and ask to be forgiven. Goad wants all to go to heaven but so many just don't believe in Him. They all make their own path in life, they will suffer come judgement day.

IF one is truly sorry for their sins it is quite simple, JESUS paid the price in full and is given to us as a gift we can either accept HIS gift by HIS love or decline the choice is ours.

WHO WILL RETURN TO LIFE? Many millions of people who are dead in the grave will return to life on earth. Even some who did not know God and who practiced bad things will be  resurrected. Read Luke 23:43; Acts 24:15. Resurrected ones will be able to learn the truth about God and to exercise faith in Jesus by obeying him. ( Revelation 20:11-13) Those who return to life and do good things will be able to enjoy life on earth. Read John 5:28,29.,, WHAT DOSE THE RESURRECTION TELL US ABOUT JEHOVAH? God made hope for the dead possible by sending his son to die for us. So the resurrection tells us about Jehovah's love and undeserved kindness. When the dead return to life, whom do you especially want to see? Read John 3:16; Romans 6:23. for mor information JW.ORG

Heaven is a spiritual place of perfection. Humans have imperfect carnal flesh natures because we are made of dirt. 

Scripture teaches that the spirit and the flesh are continually fighting over mastery of our souls, but they desire different things. Its not an easy task to learn spiritual mastery, but with discipline, dedication and practice, we can succeed.

Romans 8:5-9 — Those who are dominated by the sinful nature think about sinful things, but those who are controlled by the Holy Spirit think about things that please the Spirit. So letting your sinful nature control your mind leads to death. But letting the Spirit control your mind leads to life and peace. For the sinful nature is always hostile to God. It never did obey God’s laws, and it never will. That’s why those who are still under the control of their sinful nature can never please God. But you are not controlled by your sinful nature. You are controlled by the Spirit if you have the Spirit of God living in you. (And remember that those who do not have the Spirit of Christ living in them do not belong to him at all.)

God has NEVER made it difficult for us to go to Heaven.

Religion has. 

Only the "savior" of the christ-based faiths will ever be 

stupid enough to have you believe that you will never enter 

Heaven, or be in the presence of God, without him being there too. 

Hard? Jesus laid out the path to Heaven very clearly. All we have to do is follow the path He provided for us. Yes, there are many distractions and temptations that tend to lure us off the path, but considering what is at stake, we should have common sense enough to remain on the path, even when it is difficult.

Because all people are not supposed to go to heaven.Jehovah is going to make the earth a new earth why would he send everybody to heaven?Jesus said: “No man has ascended into heaven.” (John 3:​13) He thus showed that good people who died before him, such as Abraham, Moses, Job, and David, did not go to heaven. (Acts 2:​29, 34) Instead, they had the hope of being resurrected to life on earth.​—Job 14:13-​15.The Bible teaches that under the rule of God’s Kingdom, “death will be no more.” (Revelation 21:​3, 4) This promise must apply to the earth, since death has never existed in heaven.The Bible promises: “There are new heavens and a new earth that we are awaiting,” and “in these righteousness is to dwell.” (2 Peter 3:13; Isaiah 65:17) Sometimes when the Bible talks about “the earth,” it’s talking about the people who live on the earth. (Genesis 11:1)

It doesn't exist.