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Not to sound like an ass... but Garrys mod wasnt made in 2013... it was made in 2004, hence why the graphics arent the best... it was released as a addon for Half Life 2 and uses the same coding as Half Life 2, just some extra lines to make it so you can do what you can do.
so first you gotta have portal 1 installed on your PC
then in Garry's mod in the bottom right corner, there is a controller icon and you gotta click it
inside the menu that pops up, you scroll until you find "Portal" then click the checkbox
now in the singleplayer menu tabs, there should be a tab that says "Portal"