Volunteering will give you some purpose and self fulfillment, but once you realise the ratio of what you give compared to what you get out of it, it might feel a bit egotistical.
If you want true hardcore altruism, pull off a daring armed robbery and use the proceeds to build an AIDS hospital in Botswana. If you dodge death and the law, you'll end up with a great sense of fulfillment
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Ara, what do I care for me goose feathered bed?
What do I care for blankets?
Tonight I lie in a wide open field,
in the arms of me raggle taggle gypsy-o