Play store apk upload failed. "com.unity3d.tester" already exists

I have build an apk (size 36mb) without split binary, signed it by creating a new keystore. When I try to upload the apk it says: UPLOAD FAILED. “com.unity3d.tester” already exists.Why does it not accept my apk?, plz help me out, urgent
EDIT : i just realised that com.unity3d.tester is my BUNDLE IDENTIFIER, now plz help me out

ps- its my 1st app, i am 15 yr old

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