Exactly what he said, you're over thinking this, if you can hear your recordings thru the interface's headphone out then it's working correctly.
You need to hook your speakers up to the outputs on the interface.
If your media edition computer uses some kind of fancy 4 or 5 speaker surround sound setup I would recommend ditching the extra speakers, for music recording, straight up stereo or stereo with a subwoofer is what you need to use, any more speakers than that will just make working with recording software an epic fail in progress, especially for a beginner.
I would also disable the built in soundcard in windows device manager to avoid possible driver conflicts.