The free will of destiny..

i was thinking about destiny and free will.. free will means that anything can happen... you can go right or left.. and destiny means that something is bound to happen and there's nothing you can do about it and you were meant to go left all along.. but that's a paradox really.. I mean.. if we have free will then nothing is predetermined.. but that would mean that everything that has happened or will happen is a complete accident that reality as we know it is completely meaningless. we shouldn't even exist.. But we have this inner sense of destiny.. we know this because the word destiny wouldn't even exist.. i do believe in destiny.. but i also believe in free will.. They both exist simultaneously.. but i cant for the life of me figure out exactly how that's even possible. its like we have a choice but we don't. but we do.. but we don't.. shit.. my brain hurts!