Al-illah says in the Koran, that God will forgive all sins with the only exception of shirk..!?

no he won't be forgiven because none of the sins will be forgiven unless you toba, and ask for forgiveness. and if the sin is related only to you it will be forgiven if you ask for forgiveness IN THIS WORLD, but if the sin is related to others too then first they have to forgive you so that God will forgive you too, again if you ask for forgiveness.