I wouldn't discount yourself in being able to get the life you were seeking. As you pointed out, sometimes things just don't work out the way you expect, but nothing is set in stone either for the rest of your life. You're still young and can do many things.
Sometimes things are what they are, but you still have power to change certain situations (career, looking for a partner, etc) like what Haennie so eloquently wrote. I am sure it is a bit complicated with kids, but it can be done.