Married 10 years and have two kids... couldn't be happier in my life right now.
It's all about the mate you choose... yes if you choose someone who is an absolute fuck up you can't expect to have it end on a positive note. Choose a woman who brings just as much to the table as you do, and I'm not talking financially. I'm talking everything.... emotionally, intelligence, care, fun.
Yeah it's not always a cake walk, yes there are ups and downs, yes many times you'll want to kill each other, but I wouldn't trade it for the world.
It's not for everyone, I've said that a million times, and if you want to stay single then good for you, enjoy it... nobody is putting a gun to your head and forcing you to get married.
I proposed to my wife the very next day after I graduated college and I never looked back. She has been by my side countless times.... moved across the world for me to a county she didn't want to live in because I wanted to pursue my career. Then when I spent three and a half years doing my PhD, she was the primary bread winner in the house... but that never once changed the dynamics of things... overall financial management was still handled by me as it always has been, then when I finished she gave up her successful career because she wanted me to follow my dreams and again she moved with me to Silicon Valley because we had a good opportunity out here. When I was diagnosed with thyroid cancer she researched the shit out of it... and found me the best doctor in the country , and when we met with him and he was telling me about my surgery , I had only one question, she had like 25 and wanted to know every single detail because the man she loves was going through something tough, (my question was, how soon after the surgery can I lift?)
I haven't even talked about her family which treat me as their son and have truly been incredible to me.
I know on getbig it's not cool to talk about how much you love marriage... but I wouldn't trade it for the world.
I often tell my wife jokingly, that if I didn't have her and the kids, i would be rolling around in a brand new Corvette. But honestly, I'll take my kids sitting on my lap and telling me they love me while they poop their diapers and their pee seeping through onto my clothes any day over the Corvette... which I'm certain I will still get one day

Whatever your choices are... I hope they make you happy!