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If everyone believed as you did, and there was absolute "meaninglessness" in the universe, you and I would not exist. People would not obey laws, would crash cars into each other willy-nilly, resort to much more violence and crime than we see in the world today, etc, etc. Chaos incarnate.
Forget human laws, there would be no laws of nature. No gravity, inertia, laws of physics, etc.
You wouldn't have doctors/firefighters/cops saving lives (to take but one tiny example), even risking their lives to save others. Every day a life is being saved, in one way or another. But ... why bother, right? Life is meaningless. For if you say that the universe is meaningless, you are essentially saying life, any life in this universe is meaningless. You cannot separate the two.
By the very fact that there are laws of nature/physics in place since before we were born, and laws we humans created to better organize/govern our societies, indicates our universe is full of meaning. Great meaning.
What is wrong with the possibility of exploring and discovering even more profound meaning in our lives, and hence, the universe?