Sorry.. Have to voice an unpopular opinion here.
Children are innocent in your regret or finding it hard. They don't get to choose their parents! You on the other hand have a choice whether to become a parent or not, and if you've decided to become one, it's extremely selfish ans self absorbed to declare you regret that choice.
Your children are your family members. Small humans who have only you to count on. There is meaning and responsibility and purpose in that. You might say that you would never tell your children you regret having them, but they feel it. They feel you resent them.
It's so wrong.. Life is never supposed to be a bed of roses, but everyone who has children is incredibly lucky to have a family to call your own. The love of those little people who will become big people one day and the extended network of friends and family and life in general that comes along with them as lives move on, is the stuff that builds communities, inspires novels, builds future.
The complaint that no one ever tells you hard it is? Yes they do if you listen! The sleepless nights, the tantrums, the worry about bullying and first heartaches.. It's all parents talk about. But most parents love their children like mad, and it would be completely incomprehensible for most that someone would regret having an actual human family member in the same way as someone would regret owning a dog or a cat.
It must be some sort failure of society to raise a generation so individualistic and hedonistic that they shun the responsibility of bringing up the next generation.