Heartless, don't you think your argument is a little circular? If you do something, it's because you enjoy it. Therefore you only do things you enjoy. You are both assuming AND concluding that people only do things for 'selfish' ends.

And this actually has nothing to do with morality, because you are being descriptive. Do you think this is the way things should be? As a self-proclaimed moral nihilist, do you have any opinion at all on how things should be? If your response is no, isn't that itself a moral statement?

I don't think it's possible to avoid morality. And your perspective that people only do actions to satisfy egoistical urges is evidence for that--everyone has a preferred state of the world and acts in support or defence of that, although not always successfully. Every action you make every day must be moral. And that's funny because that's not actually a moral statement either :|