I agree that God can permit things, but I think that God always permits nature of work by the laws He put in place. If someone can only die after God permits it at a certain time that must mean that to even be able to kill oneself God must permit it.
Yes, that's correct. Think of it this way- God has a plan for the whole of His creation and each individual from the moment of their conception - God's purposeful Will. God desires only our good and thus our human perfection.
God's permissive Will -- that which refers to what God allows to happen in the world. I mean, God allows for sinful behaviour to happen even though it is not what he desires.
Why would God allow this?
God loves us so much that he respects our freedom. Evidented by the fact that we have free Will. So, God lovingly allows us to either choose or reject his will for our lives. When man sins, he freely rejects God's will. God permits this to happen as a consequence of the freedom he gave to man, even though it is not what God wants.
From the Catechism of the Catholic church:
Angels and men, as intelligent and free creatures, have to journey toward their ultimate destinies by their free choice and preferential love. They can therefore go astray. Indeed, they have sinned. Thus has moral evil, incommensurably more harmful than physical evil, entered the world. God is in no way, directly or indirectly, the cause of moral evil.176 He permits it, however, because he respects the freedom of his creatures and, mysteriously, knows how to derive good from it. (CCC 311)
For almighty God. . ., because he is supremely good, would never allow any evil whatsoever to exist in his works if he were not so all-powerful and good as to cause good to emerge from evil itself.
So, God does permit people to end their lives, although it is contary to the Will of God. Ultimate rejection of God's love and will leads to one place.. and that place is Hell. God doesn't send people to Hell, though, they freely choose it and out of love, God respects their wishes.
Again, the CCC (2280): Everyone is responsible for his life before God who has given it to him. It is God who remains the sovereign Master of life. We are obliged to accept life gratefully and preserve it for his honor and the salvation of our souls. We are stewards, not owners, of the life God has entrusted to us. It is not ours to dispose of.
(2281) Suicide contradicts the natural inclination of the human being to preserve and perpetuate his life. It is gravely contrary to the just love of self. It likewise offends love of neighbor because it unjustly breaks the ties of solidarity with family, nation, and other human societies to which we continue to have obligations. Suicide is contrary to love for the living God.
However, because God is merciful, we must remember..
Grave psychological disturbances, anguish, or grave fear of hardship, suffering, or torture can diminish the responsibility of the one committing suicide.
(2283) We should not despair of the eternal salvation of persons who have taken their own lives. By ways known to him alone, God can provide the opportunity for salutary repentance. The Church prays for persons who have taken their own lives.
Therefore, I believe that euthanasia -- or assisted suicide -- is wrong and contary to not just the love, will, and law of God, but also to the natural law.
And those considering it out of fear of living their lives, whatever the circumstances, must be given support, help, and love and prayers - not carted off to be killed as though their life has no meaning anymore.
Remember, "There is no fear in love, but perfect love casts out fear." - 1 John 4:8.