It is better to not believe a truth than to believe a lie, because this defines yourself too. If you believe a lie that has negative effects, it shows you may have malicious intentions. But if you don't believe a truth that has negative effects, then you may be well-disposed.
Don't let the illusion of destiny keep you from doing what you love to do - for nothing is meant to be, or not to be - it is only your willful and persistent action that determines your destiny.