Welcome to PC sullen. (you too, Janine!) I can understand the wanting to get away, but I think to leave is too drastic a step right now. I would caution using the word or idea of being "selfish."

You may very well have good potential for a great marriage and "rest of your life" right where you are. You may be suffering depression... talk with your MD about it (and make sure your physical is up to date, many physical ills cause feelings like these imo.)

It's never too early to go to counselling...couples counselling... for even great marriages can get better. TC