As a member of military, you are allowed to own property, but have to take orders. Same, same, but different. But yes, many people compared the USSR to essentially a huge military organization.

School students are very limited in rights, indeed. Their welfare depends on welfare of their parents. But they can hope to become free adults one day; no such hope for citizens of socialist countries.

What is your point? That every person who has to make decisions with costs may as well be in prison? Going to school and serving in the military are only different kinds of prisons because you can't escape them? You can't escape capitalism either.