Yeah, that would do it. I had the usb formatted as MBR instead of GPT. So I successfully installed macOS and it is running well.
However, the laptop display doesn't work, so I need to use an external display. Is there any way to fix that? Also, the built in keyboard and mouse do not work, so I am using usb ones. I assume at least the keyboard/mouse issues can be fixed with kexts, but I'm not sure where to find those or what to look for. So basically, it works fine as a desktop but not so much as a laptop. It's fine if I can't fix these but it's worth trying.
Oh, and I should add that I cannot boot to macOS straight from the hard drive. Instead, I must boot from the usb EFI partition by using the computer's startup keypress and boot menu, then choose my startup disk through opencore. I need this usb back so this can't really work as a permanent solution.