Is marriage really a requirement to life for most? Maybe for some but I still believe there are others that lives a more fulfilled life for themselves without getting married. There are also a few religious persons that there region or tradition forbids them from getting married or birthing a child.
Life, life is just as complicated as that. It's never fair to anyone nor does it present to some an advantage over the rest. Even the rich have got places that irritates them too.
We've just to keep trying and figruing ourselves out with every step, making mistake and correcting them.
Maybe if you say the requirements for life are a little wrong, but in this case even though there are some beliefs from individuals or groups who believe that they don't have to live to get married, this is only a small part of the many people who of course make marriage one of the goals of life. them and one of them is me.
I personally do not consider it a requirement because I consider marriage is one of the goals that I must achieve in my life so that this is indeed one of the priorities that I must do because this is included in the life plan which I think is ideal.