I assume you're not running any services, (web-server, ftp-server, app-server, db-server, irc-server, ...) no sshd, telnetd, etc.
How should a remote cracker get into your machine?

If you don't have a door, you don't need a lock.

My first linux-newbie-installations HAD a webserver running by default (apache) in the mid-90ies. But this shouldn't be common to nowadays installations/ bundles.