A person who needs to be the center of attention might be described as a narcissist, exhibitionist, or possibly an egotist, a show-off, or a grandstander.
I would simply categorize them as 'insecure'.
focus
attention seeker
The center of attention is a term typically used to refer to people who like attention, which is evidenced by their words, actions, and often times charisma. For example, you might consider Paris Hilton to be the center of attention in the gossip world as she actions typically draw attention to her. A coworker might be the center of attention because they are opinionated, or dramatic, or charismatic, or boisterous. A person who is the center of attention may also be labeled as such due to their position or status in the workplace or in the nation, IE Barack Obama is the center of attention, not necessarily because of his words, actions, or charisma, but because the citizens of the U.S. and potentially the world look to him for answers. Finally, a person who is the center of attention can be someone who isn't necessarily looking to be the center of attention, but are that way because of a particular situation. For example, at a birthday party, the birthday person is the center of attention because people gather at the party to celebrate their birthday, however the birthday person's actions, words, or charisma may not be the primary reason they are the center of attention.
call them buddy, or jugs
ADDer
Lonely
A person who seeks attention all the time can be referred to as an attention-seeker or attention-seeking individual.
attention wh@re is the phrase that was coined by Jesse Dawson
a photo freak / attention hog
give him the call me sigh, that will get his attention.
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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.