as salam alaikum
repentance is returning to Allah after having sinned or misbehaved. It implies remorse for a sin that has been committed, resolution fo not repeating the sin again, and giving back the right to the people that have being wronged (if any). Repentance does not imply mutilation of any part of the body and actually it is forbidden for a believer to self-mutilate himself.
With prayers for your success.