Today, at this very moment, I have control over my destiny because I am consciously relating my thoughts to my actions and, I'd like to think, without any help from an invisible Being/God/Omnipotent Whatever! What my brain creates my hands turn into words, via this laptop. I want to do this. I make it happen. I am content.
But the word destiny has many layers to it, a bit like an onion; and yes, it can make you cry if you don't control the unpeeling. If treated properly however, cooked with the right ingredients in the right oil, destiny can be very tasty and nutritious.
My destiny is my future and my future is made up of tiny tiny seconds that merge into minutes, hours and weeks and so on, into years. At this very edge of NOW I still retain control but cannot say absolutely that this will be the case in five minutes or five years time, for that is a carte blanche, yet to be filled.
I don't know of any unseen force that is in control of my destiny. The ancient Greeks believed in the Fates, and the Gods, and asked questions about the future of the Oracle; this was part of their culture and you could be punished for going against your destiny, what the Gods had planned for you.
Astrology has an appeal for some and in medieval times was used extensively to forecast destinies, both individual and collective. It's a beautiful concept, a romantic ideal. In India I think it still holds sway for certain sections of society. I don't want my destiny to be written in the stars as that could undermine my will and I'd view that as pretty serious!
For me, destiny is an integral part of my psychology, what I am as a person, and in my experience I am in control of that person - for most of the time! Yet, the future will conjure up all sorts of different challenges, events and unknowns for all of us. Some will see certain happenings as 'destiny' others as random accidents or just plain old bad luck.