There is an element of chance in everything.
Every aspect of your education and career has been affected by quirks of fate. Great jobs are found or ignored depending on who read the classifieds that day. New opportunities are glimpsed or missed depending on who is paying attention.
Still, you have to embrace the uncertainty of outcomes and realize that chance can play for you or against you on any given day. But the more you try, the greater your opportunity to benefit from a lucky outcome.