I'm a 42 year old woman who feels old and meaningless, and I don't know what to do!

Over the highlights! My mom is about your age! She is now very open-minded, if you have a husband who loves you, you love the children, you should think about actually your life is happy, to be realistic, half of the body into the earth, do not think too much, live a little easier, the food, the sleep! Maybe even travel. Anyone can get old! The mind is the most important!