What I want from life

I have herd that life gives you everything you ask it for provided you know what you need from life.when I came across this phrase for first time I thought this cant be right I have asked life many things and haven't got most of them,but I soon realized that I myself did not know what I really wanted from my life for I kept on changing my goals , wishes , wants so quickly that I confused life and it ended up giving me nothing.