The fact that you personally place value on the concept of meaning, has nothing to do with the question of whether or not your life has meaning.
My particular brand of 'Secular Humanism' doesn't require me to try to find meaning in an old book that tells us we came from one couple, there's a god up there who's a real prick. My beliefs don't require me to make constant excuses for this god, or this book. When reading the bible, if one is to try to believe it, one must start making excuses for it right from Genesis 1:1 on. My beliefs make logical sense. The fact that I feel a meaning to my life has nothing to do with whether or not the meaning of my life has any effect on the universe at all. MY universe is made up of my family and those I love first, followed by my love for all other humans. That is something every one of us feels, even you pious folk. What's more, it's a product of our evolution.
The fact that the universe has no purpose isn't a bother at all. Actually, I'm glad. I'm now free to do what I like. That doesn't mean being selfish, it means I don't have to dedicate my life to anything other than my loved ones. That my friend, is the beauty of it all. Do you think your beloved creator would rather you dedicate your life to whatever his favourite humans dictate is a way to serve him? Would he/it not rather you spend your energy and resources helping those around you, enjoying your life? Not worrying about whether he approves of you enough to NOT kill you for not doing what his silly book of riddles says...?
If this issue is the last one that holds you back from letting go of god, then I wish you well in sorting it out. You will. If you think that ANYTHING you could do could have any effect on the universe, then you are still stuck in the same place. If you think ANYTHING you could do could have any effect on a creator of this universe, then again you are still stuck in the same place.
We're not so different, you and I.