I don't know if everything is destined to do one thing due to some higher power or whatnot.
But I do believe that every mote of life does have a reason for existing.
If that reason is simply to be alive, then so be it. But life has a purpose. It is too beautiful and fragile and incredibly amazing and mysterious not to.
I don't know if we're all meant to do something or destined to do anything, but there is a reason for my existence.