The purpose of prayer is not to change God's mind, which always knows your wholeness and your deservingness. The purpose of prayer is to change your mind so you can see through the eyes of God.
If you are not living with a whole heart now, the end of the world poses no threat; your life is already gone. Life is only as valuable as our presence to enjoy it. To miss the beauty of the moment because you are preparing to protect yourself from the next one, is to trade a precious gem for a cheap trinket.
It is not selfish to be happy. It is your highest purpose. Your joy is the greatest contribution you can make to life on the planet. A heart at peace with its owner blesses everyone it touches.