Since you believe there is a heaven and that you have behaved well enough to go there, you apparently believe there is a God who will judge us all, and He offers heaven as a reward for those who deserve it.

 The problem with setting your own standards, or your parents setting them is- What if they're wrong?  What if your standards are not the same as God's?  I know that gets a little personal, but there are billions of people that have lived and died on this planet.  most of which had some kind of standard for living or religious practice.

If there is a God who is the final judge of our actions, He must also set the standard for those actions.  Otherwise there could be no real justice.  Everyone would just do what is right in their own eyes.  Hitler thought he was doing the right thing, and had no remorse for his actions.  Osama Bin Laden feels he deserves a reward for his terrorism, which he believes honors God.  Everyone can't be right.  God has to set the standard. 

That's why we are so thankful that He left us His Word, so we will know what He expects. 

Click here to take a little test based on the Bible that tells us if we've been "good enough".