No, why would it? A marriage isn't necessarily about having children, it's a bond between a couple and some would say God, I guess. It's just taking your relationship to a huge next step, and not all couples want children, nothing wrong about that. But I know what you mean, usually a married couple either adopt or make their own baby. Or whatever way they might get a child.
No I don't think it's meaningless, I think it's a good thing. You get to be into your mate and vice versa without any distractions, to really concentrate on yourselves having wonderful love, patience and tolerance to grow.
No. I was not able to have children due to my health. My marriage is definitely not meaningless. I am a mother to cats. Yes, that's right, I said cats. They are a very important part of our family. You may think I am off my bean, my choice, my life.