How do I launch MY OWN custom map?
By the way, I used hammer world editor on Source SDK. I made the map, and I'm frustrated that I can't even play it. 
I don't know how to launch it! Whoever helps me will be my savior! 
why don't you look at how the other maps do it and figure it out from there? 
but anyway for portal 2 you type in map <mapname> after putting the BSP into the maps folder
as for portal 1 you put the BSP into the bonus maps folder and use the bonus maps option
Did you try this? http://developer.valvesoftware.com/wiki ... ring_Tools
Sorry, I'm kind of a noob. What does BSP mean? Oh and my map is for Portal 1.
The BSP is the compiled map.
I just tried that, but there isn't a bonus map folder.
If this is a Portal 1 map then all you need to do is place the map inside (wherever Steam is at on your hard drive)portalportalmaps, then launch Portal, open the console and type "map (whatever your map name is)".
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I tried that, but it didn't work. It just says no such map.
Then you put the map in the wrong spot. You don't need the .bsp extension on the end, either.
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It says that it's a BSP file, but there is no .bsp in it's name, so how do I get rid of that? Also, I went to /Local Disk/Program Files/Steam/Steamapps/tripleg100/Portal/Portal/Maps. (tripleg100 is my username.) Anyway, is that the right spot? Also, when I click on the file directly, it says error, setup file 'gameinfo.txt' doesn't exist in subdirectory 'hl2'. Check your -game parameter or VCONFIG setting.