Welcome to the forums. Maybe you have enabled 'Show Taps' in the Developer Options or, depending on your phone, some kind of 'Glove mode'. We need more details to be sure.
I'd like to recommend creating a account so me or other members can assist you, as guest have limitations in replying here and if we need further Information to communicate with you.
I'll provide a link to register, please come back to your post so we can further assist you . Thank you