Can we truly do something for another?

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Aside from Deterministic concepts etc When we actually make a choice can we truly do anything for someone else? First of all when I say someone else I don't mean can we do something that results in benefiting someone else but can we do something for nothing, for no reward? When we give to a charity we are doing it for ourselves, simply because we experience good feelings for doing it, we are getting something worth more than what we give. Another example is when we help the old lady across the street, is it not done purely to quench our guilt that conjures up inside of us? Is it possible for a human to do anything that it thinks will result in a equal or greater reward? Many people follow the rule "If you do good things you go to heaven" and people follow this for themselves (They get to go to heaven!) So this really contradicts what christian religion preaches does it not? This might seem like a petty truth but think of what the truth of this means. It questions such acts as Jesus dieing for 'us' and not for himself (If it did indeed happen at all), the millions upon millions of volunteers that help others, all the saints, philanthropists, people that have dedicated their lives to others (as they say) and even our parents, did they have you purely for you and not themselves, did or do they do everything for you? Apply my first questions to these and you could be suprised what comes out.

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