I have a friend who has been single for more than 20 years. The last time he had a girlfriend was back in school. He's handsome, educated, highly intelligent, hilariously witty and even artistic, but he just does not want to have a relationship with anyone. But being with a partner is definitely not for everyone.
Personally, I love being married. Sharing everything you have, all your thoughts, tolerating each other's differences, supporting each other through thick and thin gives me a high sense of security. I have a very logical mind, even slightly robotic according to my wife while she is emotional and extremely compassionate. I feel we balance each other out.
However, if you do have a child, then I think yours and your child's life would be easier since you only have so many hours a day.
Not for me, I love having some one know me better than myself and I them. We've been though really rough times together, made us stronger as both couple and individuals, it's been a very short 7 years. We talk and were best friends. Couldn't see it any other way. Maybe it's because our personalities compliment each other, we match on our MBTI or could be fate, Either way it's great.