Libertarians don't believe in total individualism. That's what an anarchist believes in. I do have a question; when should we stop being individuals and become part of the collective?
Wrong! Libertarians do believe in total individualism. You ought to read the LP Statement of Principles and platform. As far as anarchists go, the vast majority of the vocal anarchists are collectivists, and thereby not libertarian. There are however individualist anarchists, of which many can be found in both the libertarian movement as well as the Libertarian Party.