Different people have different needs, so I'd like to ask why you believe you're an attention slut. Some people are like hardy plants, they don't need much sunlight or attention, while others need more. One isn't wrong or right or better or worse as long as both are healthy.
You haven't given us many specific situations, but you might have a belief (unconscious) that your happiness depends on other people and their evaluation of you. Raising your self-esteem might, help, too.
Check out a counsellor and see what they say. It can't hurt, can it?
Accept yourself. Accept that you wish to change, but do not be disgusted or hate it. It is a part of you, as much as the good things are and your wish to change it is also a part of you.
HTH.