This is ultimately the biggest advantage to being a single woman. You have the unique opportunity to mold and shape your life and pursue your dreams.
There are no reasons to settle for second-best and no one else is depending on the choices that you make. Even if your ultimate goal is to marry and settle down, you might as well get your own life in place first.
So go for the brass ring and shoot for the stars. Create the life that you want for yourself and then, if you want one, find a partner who will fit into that life.