Do ppl that do feel pain when they cut themselves or whatever they do.

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most people inflict self harm to gather attention but if you really care about this girl then talk to her and seriously talk with her to find out why she's doing this to herself there could quite possibly be a reason she feels the need to do this.

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A lot of people don't do it for attention.

There is probably an underlying reason to why your friend is self harming, for example she is the subject of physical abusive. Self harm is a release method. It helps the person release their pain, or it may be a way of punishing themselves. Talk to your friend and try and find the reason for her self injury.

Or their attention whores.

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Redemption comes.