macOS Catalina

clean installation

I wanted to perform a clean installation to my MacBook Pro with Touch Bar (I don't know production year) It is already running macOS Catalina )10.15.3 but I need a fresh start therefore I want to perform clean installation.

I prepare a usb drive, I download Catalina from Mac app store, and I created a bootable usb drive with it. So far I did everything right (I assume) however when I restart my computer (by holding option key) I I can not see the usb drive but only Machintosh HD (which is my main drive) what am I doing wrong? how can I make my computer to see the bootable usb drive when I reboot?

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