Are you running a recovery? Like twrp or cwm and if so what version?

No clue about drivers for mac
Maybe you would have to run emulated windows and load drivers that way. I looked and could not find any for mac

But best bet if you do have a recovery mode, then I would just buy a 1.69 otg cable from ebay with free shipping to mount a usb stick in fat32 with your fastboot and rom on it.
LG G2
You can fix un-educated, but you can not fix stupid!