Que Sera, Sera

So this is life? Que sera, sera. What will be. will be. But if that is the case, can we really control our own destiny? I mean, think about it! We can manipulate our future and we can change ourselves, our actions and our beliefs, but can we really control our own destiny? I don't know anymore. It's kinda like the "Butterfly Effect". If we could go back and change an incident to try to correct a wrong we did, we would ultimately change everything that happens beyond that point, but is that so bad?
I want to believe everything happens for a reason, but I don't like waiting to find out that reason. I am very impatient and I want to know NOW. It's hard not thinking about the what if's, because they are forever imbedded in the back of the mind. It's hard forging ahead and not looking back, because it is human nature to remember what happened in the past. But then again, there is no future in spending our present worrying about our past.