You go through stages in your career that you feel very good about yourself. Then you feel awful, like, 'Why didn't I choose something else?' But overall I'm pretty satisfied that I made the right choice when I decided to be an actor.
Thirdly, even if we assume that the world is governed by purpose, we need only add that this purpose - or, if there are several, at least one of them - is not especially intent on preventing suffering, whether it is indifferent to suffering or actually rejoices in it.