How do I figure out how many pixels in my game is a meter, I mean it doesn't need to be that realistic does it?
Just use an object in game as a reference. You can give a rough size in meters to an object, and just do (Object size in pixels)/(Object size in meters) to give pixels per meter.
For example,
Humans are rarely taller than 2m, so if you have a human character that is 128px tall, you can just say 64px = 1m