After importing your video clip, it may have an audio file associated with it. If you want to keep the audio, but also add your recorded voice, simply record into a new audio track or, if already recorded, import the voice audio into a new track. You can then do things like duck the game recording audio so your voice is heard better, add effects.. etc.

If you want to completely remove the game recorded audio without also deleting your video, click to highlight these events, hit "U" on your keyboard (U for Ungroup) click away and then click to highlight just the game audio event. Delete it and the video event should remain.

When i import the video it doesn't add another audio track, just a video track, that is what is so confusing

That is not the same as: " I cannot find out how to include my voice file without getting rid of the video files audio, ..."

If the audio to the video Is not there how can adding an additional voice file "get rid of it"?

How are you putting your video file on the timeline?

Sounds like a codec issue.

I have tried to put the video onto the preview pane first, then drag it onto the track, and i have tried to start by putting it on the track, both result in the video audio not popping up on another track like it is supposed to

Well, that's nothing like you said in your first post.
Provide the codec details, using MediaInfo, a free download from Sourceforge, and we'll take it from there.

TheL0neCamper
I've seen similar problems for bandicam owners recording sound in mp3 format. Recording sound in PCM format (it's available in most video capture software) fixes sound importing issues for Vegas.
Please provide recording software name/version and settings for audio recording (codec, settings if applicable).