Just a realization

Do you ever just sit down & think? I thought about this, have you heard the saying everything has a reason, & it was meant to be. Well even if you tried to change something in your life that you think will change the future, what if you were supposed to do that? What if doing what you planned on doing in the first place was the option that changed your future instead of what you did. But you can't change it because everything you're doing now, you've done for a reason. It just amazes me how we really don't know anything about life.