The film you might be talking about is
sliding doors in it her life takes two very different directions due to whether or not she misses her train,but she still ends up with the same soulmate.I think dreams can show us the different directions our lives could have taken,I remember I started getting involved with this guy and since the day I met him I dreamt I was going to marry him each night,I saw our house etc,then one day I had a dream of a big sign that said "husband lost,let go" I parted ways with him shortly after.Why he was lost,I don't know.But sometimes I still wonder if that was a life path I missed.
You might want to read the ancient Scandinavian beliefs about
fate,or other concepts of fate,there are many.
I agree that you're at a crossroads at it does matter which door you open.