What about if you find the cure for cancer, but never get married. Have you wasted your life?
What about if you meet an amazing person and spend the rest of your life with them in exquisite happiness, yet never actually marry them?
Or what if you are simply happy all of your life, without ever marrying or having a relationship of any kind with any other human?
To me, marriage is completely insignificant in the "grand scheme of things".