i don't really believe there is a thing called ordained destiny

i believe the destiny of our lives is determined by every nuance of choice we make
changing a simple decision such as going to university a instead of b can change your entire life path
you see that's destiny, the choices we make, the choices our parents make literally shapes our life
can we say those that committed suicide, it's a destiny ordained by god ?
and same god said committing suicide is a sin. you see it makes no sense
the destiny of our lives is literally in our hands and we're shaping it by every little choices we make