Libertarianism, Anarcho-capitalism or Voluntaryism are different names for basically the same ideology and fall under Anarchism, most of the Libertarians here probably are Crypto-anarchists (https://en.wikipedia.org/wiki/Crypto-anarchism).
People who call themselves Anarchist, mostly are Social anarchists (other names are Libertarian socialist or left-libertarianism).

Both want a government free society, Libertarians or Social Anarchists who want a minimal state are Minarchists.

If you want to put me in the best fitting box, it probably would be Libertarian/Anarcho-capitalist/Crypto-anarchist/Voluntaryist (pick a name you like).