Is there a way to record my screen, as well as the internal audio? Like, if I were recording a game, it would record the screen, and the sounds from the game.
Maybe is RecordMyDesktop something for you? It has the ability to record your Screen and Audio, but I'm not sure if it supports games.
You can install it with sudo apt-get install recordmydesktop. If you want a GUI, you need to install one of the packages gtk-recordmydesktop (GTK) or recorditnow (QT).