Not at all. I think it is sad to depend on others to give your life meaning. If you mean that my life can have no meaning or purpose unless I serve others then I not only consider that wrong but evil. If I do things for others it is because I have a selfish interest. I never do anything selflessly and despise a person who does. But I think you and I would have a very different definition of what is selfish and what is selfless. That is because we are coming from a completely different metaphysics and epistemology.
Let's go back to what you said earlier: "Life...needs NO external sanction or purpose."
Let me ask you point blank: Is there ANY social or ethical purpose in life? And, if so, how do you determine what that is?