I need some help, I forgot my code and inactivated my iPhone

Hi, I bought an iPhone Xr on the last 20th and yesterday I went to change my code because I found it very easy, I put the same verification code of WhatsApp, because I was already used to it. Yesterday I had my face covered and I tried to unlock it by face id, but without success I went for the password, but I couldn't. I tried until my phone went to sleep. I was trying to do it using this method, so I remembered that I had never connected my cell phone to the desktop, nor even accepted the computer on it. I've tried to recognize the device several times through Computer Management, but I can't. If anyone can help me, thank you!