Big Sur update broke my computer

I updated to Big Sur today. After sitting through the update, it gave me an error at the end and reset my computer. It repeated this process twice over. Now I loggin, it goes to the apple logo, and resets back to the Apple logo. Its in a loop. please help!! 2017 MacBook Pro 13 inch Touch Bar. I tried a command + option + P + R but when i get to the login it says my password is wrong which it’s not.