For the rest of your life to be as meaningful as possible, engage in spiritual practice if you can. It is nothing more than acting out of concern for others. If you practice sincerely and with persistence, little by little, step by step you will gradually reorder your habits and attitudes so as to think less about your own narrow concerns and more about others' - and thereby find peace and happiness yourself.
What is important is to see how we can best lead a meaningful everyday life, how we can bring about peace and harmony in our minds, how we can help contribute to society.
The animals of the world exist for their own reasons. They were not made for humans any more than black people were made for white, or women created for men.