It's called, Self-Cannibalism. It's a disease.
A self - eater, i think.
The disorder is Pica.
Insecure
Conversing with oneself is known as self-talk or inner dialogue. It is a common behavior that can help organize thoughts, problem-solve, or provide emotional support.
Ambitious.
Clumsy
Someone who is obsessed with themselves is commonly referred to as narcissistic or self-absorbed.
Derealization and depersonalization sindrom.
People from Brisbane do not tend to call themselves anything, except in relation to being a proud Queenslander. Sometimes people from Brisbane call themselves "Brisbanites".
You can call them George Costanza.
If you must label them, ask them how they would classify themselves.
Call your insurance provider and take them off.