Can someone help me with this??

‼️EDIT: ‼️ So I got it to install properly now, but when it asks if I want to use the usb drive every time I reboot the computer or my hard drive I'll pick hard drive and I did the correct one it tells me to restart holding the option key down and choose opencore legacy patcher, but I don't have that option i only have my Ventura installer, my copy of monterey that I also have on the otherside of my hard drive just incase, and the mac hard drive with a picture of the Ventura logo on it. I click that one, and once it restarts, it asks me the same question about wanting to boot with the usb every time or my hard drive. Does anyone have any videos, or have you run into this problem?

So I have a 27" late 2015 Mac. Im currently runnimg monterey and trying to install the current version of Ventura. When I go to restart my computer while holding down the option key, it doesn't give me options to choose what system I want towindows. with, It just restarts. Can anyone help with this?

I used a USB with Ventura and open core on it. I'm also doing a clean install. I hope this makes sense, and I've given all the right info/context for someone to help me with. Also, my Bluetooth keyboard and mouse still work during this process. It just won't pull up the boot window.