A lot of people seem to struggle with the concept of free will vs. destiny in Christianity. A lot of times, I think that people refuse to admit just how big God really is. A lot of times, free will is thought of as the ability to make your own decisions. You have that, for sure. God said so, in His book. But he also said some other things which sounds very contradictory to that. He mentions, in His book, that He knows all the names of those who will be saved. Every saved person is known to God before they make the decision.
If your decision is already decided for you, who made the decision? Did you make it, or was it just destiny?
God, the God that I serve, knows everyone in this world better than they know themselves.
Have you ever started a sentence, and had someone who knows you really well finish the sentence for you? Because they knew what you were going to say before you said it? Well, God knows you better than that. In fact, He knows you SO well, that he not only knows what you're going to say, but also the outcome of EVERY decision you are going to make in your life.
Does this mean you are not in control of your own life? Of course not! Knowing what you will do does not make it someone else controlling you. You still are doing what you decide, He just knew that you would decide to do it before you did. He's that big.
The only person to ever walk this Earth with full knowledge of where he was heading in life, and what would happen, is Jesus Christ, and he was for not changing it. He wanted the story to go the way it was foretold, and do everything he was supposed to. Everyone else, however, has no idea where they're going to be in the next five minutes. Sure, you could make a decision to leave work, and go out and get a new job. But God knew I would be writing this article, that you would be reading it right now, and how you would react to it. You can't fool him, or mess up his plan - it's laid in such a way that he even knows how people will respond to his movement on Earth.
So, yeah, your fate is sealed. Absolutely. But not because someone else decided it for you - you decide what that fate will be. But God already knows what that final decision will be.