But the thing I dont understand is, I made the choice, Allah might have decreed it but he gave me the free will to make the choice so the question comes, was it the right 1. He never forced me to make the choice I made even though he knew which 1 I would make and it was in his decree. Is my understanding wrong?
I'm not sure how to answer this bro. However, this kind of question, I never personally have cause to ask myself. Simply because I never allow myself to be in such a position.
You can do it too. Take the fact that we don't know what the future will hold for us. This means, every choice we make, ideally we should make it after having consultation with Allah via dua and istikharah. E.g. even something simple like 'Oh Allah, guide me to whichever action is good for me in the long run' will do.
Now, when we make dua, we ought to do it with full conviction, we should have trust/tawakul in Allah and fully submit our cause to him when we make our dua and accept his wisdom over us. That way, we remain content
whatever happens, as we know Allah is the one who guided is in our choice (remember, full conviction, hence there is no doubt that it is Allah's guidance, even if things seem bad on the surface). So since we have sought advice from Allah (the All Wise) we never let ourselves get into a position where we need to wonder whether we made the right choice, because by default it's going to be the best one. We have to trust in Allah, of course.
Try to make it habit to ask Allah for guidance on even the smallest of matters.
The Prophet (sallallahu alayhi wasallam) said, "Strange is the affair of the Mu'min (the believer), verily all his affairs are good for him. If something pleasing befalls him he thanks (Allah) and it becomes better for him. And if something harmful befalls him he is patient (Saabir) and it becomes better for him. And this is only for the Mu'mmin." [Muslim]