One answer to this question could be a person with a complex post-traumatic stress disorder, formerly known as Borderline Personality. Cutting themselves, usually in a non-life-threatening way, relieves tension and helps them feel emotion.
Recent thoughts are that the disorder stems from a dysfunction in attachment. Emotions are often one extreme to the other and treatments can include Dialectical Behaviour Therapy or Emotional Regulation therapy. Medication can help specific symptoms such as if the person is also depressed.
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A person who is obsessed with cutting themselves is typically referred to as having self-harming behavior or engaging in self-harm. This behavior is often associated with underlying emotional distress or mental health issues that need to be addressed through therapy or counseling. It is important for individuals struggling with self-harm to seek help from a mental health professional for support and treatment.
A person who sacrifices themselves for others is often referred to as selfless or altruistic.
A person who is only attracted to themselves is known as autosexual. This term denotes a strong romantic or sexual interest in oneself.
A person with low self-esteem is often referred to as having poor self-image or low self-worth. They may have feelings of inadequacy or lack of confidence in themselves.
You could call this person a "selfish immortal."
A person who inflicts pain on themselves and others for attention may be exhibiting behavior consistent with a personality disorder, such as borderline personality disorder. It is important for them to seek professional help to address these harmful behaviors and underlying issues causing them to act out in this way.