Everyone is supposed to find their purpose for happiness, fulfillment, or well-being.
Most are Judeo-Christian ethics, which means our purpose aligns with societal influence: we want to be “good” people. Your purpose is commendable but is it yours?
Give up on being a good person, and accept yourself as a person. By shedding as much of the societal pressure as possible and following your passions, you stand a chance to find your purpose.
It is odd that you must give up trying and drift into your purpose: seeking it leads to mimicking other people’s purpose.