There is no heaven, and if there was, do you think Coach would like to be I the same place as Michael Jackson, Liz Taylor, MLK, Hightower, Bruce Lee, Gandhi, Marilyn Monroe, all are?
These are matters of faith, my friend. You have as much proof that heaven doesn't exist as I have that it does. For you this is all there is. Nothing you do here on earth really matters. Whether you are a good person or an evil person it really doesn't matter in the grand scheme of things. It's all meaningless.
Though I cannot prove otherwise, I choose to believe that there is more to life than just the material world. That all of this didn't just happen by chance. I believe this allows me to live a far more richer and meaningful life and gives me an incentive, the strength and will to always strive to do good and to be a good and honorable person. And that it does matter if you are a good and honorable person not only in this world but in a cosmic sense.
Assuming you are a half way decent person, I commend you for having the strength to go through what is essentially a meaningless life.