I have mixed opinions for this one.

On one hand, you obviously don't choose your passions because you can't just force yourself into liking something so deeply that you can't imagine your life without it.

But on the other hand, if you were raised practicing a certain type of skill, like how some parents make their kids follow a particular field from the very early stages, then you subconsciously start to see it as your passion without actually choosing it for yourself.