If you think that the correct reason for believing in Jesus is that he is truly our God and Savior, you are right. I have not heard anyone say directly that he believes in Jesus because he wants to go to heaven. This is also a perfectly good reason. To want to go to heaven is not being self-centered, for heaven is exactly where our heavenly Father wants us to go, exactly why Jesus came to us to tell us in the first place. So, yearn for heaven and believe, and Jesus will take care of you.