You find me when your sad, And kill me when your mad

Question

I live on the shores and in the sea,

The land won't be with me.

I spend my time on the other side,

Waiting for you to come beside,

So you can die.

You find me when your sad,

And kill me when your mad.

You chain me up, break me apart, and shave me down until I am nothing.

When you come to me next, you meet the same fate,

Murdered and killed like a little plate,

All to clean your little slate.

Who am I?

Answer 1

are you a solute containing sodium chloride? (a salty fluid?)

I live on the shores and in the sea,

Salt water

The land won't be with me.

Fresh water is on land

I spend my time on the other side,

on the other side of your skin is salty blood

Waiting for you to come beside,

waiting for the blood to be beside your body instead of in it.

So you can die.

without blood you die

You find me when your sad,

Salty tears

And kill me when your mad.

a reference to damaging one's circulatory system.

You chain me up, break me apart, and shave me down until I am nothing.

a reference to the heart as a chamber for salty blood "chain my heart", "break my heart", "becoming heartless" all song lyrics about the body's salt-fluid pump

When you come to me next, you meet the same fate,

now this person is slitting their own wrist; he is coming in contact with his own blood on purpose!

Murdered and killed like a little plate,

a little plate can be broken as easily as you can kill yourself

All to clean your little slate.

suicide might be to clean one's slate of guilt or shame