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You always act out of a consideration for what it is that you desire or fear, out if your preference for the anticipated outcome of your actions, or out of the avoidance of the outcomes you'd prefer not to occur.

Your acts are motivated by the perceived value of things, hence no act could be selfless unless someone else was making your decisions for you, a players character in a video game is always selfless because they are controlled by the player and programmers.

A selfless act is an act that benefits others, but doesn't benefit yourself, but since what constitutes benefit is subjective there is nothing which could conceivably fit this description.

If you did something you had a reason to do it, the presence of a motivation is always what makes the act at least somewhat selfish.

You have to do something that you truly didn't want to do, and that requires a loss of control over one's own actions.