Smells kinda lemony, but I don't think it's lemon balm. Pretty sure it is in the mint family judging by the square stem and opposite leaves but I would love to know the species.

It's definitely a mint. I would actually say it IS lemon balm if you're getting a lemon-y scent from it. It looks exactly like lemon balm.

Looks more like a Salvia to me....S. elegans/Pineapple Sage maybe (this is a guess!)

Mystery solved. I am pretty sure it is chia, which is a type of salvia. Salvia hispanica to be exact. Thanks for your help, guys!