You gotta serve somebody but the whole point of libertarian freedom is that you choose when and how to give it up. You can join the army, marry, adopt a religion, start a job, have children, or simply make moral judgements about the world and attempt to live by them (note that many of those things are not "hedonistic").
Libertarian freedom was hard won, it works, and it would be a damn shame to give it up due to the anxiety experienced by 20-somethings. Relativism is in no way the certain outcome of liberal societies. To the extent that there is a problem, it's non-judgmentalism, the trendy idea that it is suspect to render judgements and live by them.
I am from India, and the freedom we won wasn't libertarian freedom. In fact, most independence movements were driven by reversing colonization and racist governance, not seeking libertarian freedoms. Most nations that achieved independence would laugh at this concept.
Freedom or liberty in a more authentic, humanistic sense, also in the same way religious people understand it (no coincidence that Islam literally translates to 'submission' (to god)) grounds you in reason, reality and requires that understanding what legitimate authority is like. Only from that point can you actually start to make genuinely free decisions, you need to be set free from(!) a whole bunch of things first.
It's also btw why so many young people today, less coerced than ever before, don't feel free at all, just disoriented, and why they flock to political authoritarianism. The sort of relativism invited in by not properly understanding the relationship between authority and freedom has the ironical result of creating demand for some of the very worst forms of oppression.