You tell yourself that everyone is an individual with different hopes, dreams, and interests. That it is unfair to put expectations on them of what you want instead of what they want.
That there is still time and perhaps what they are today is not what they will end up being in five or ten years down the road as they still continue to learn their lessons
That as long as they are happy and healthy, that is enough for you.
That no matter what they turn into, they can never disappoint you because they are your children.