Could it be
I can't hear a word you say.
A rumor is something against which you can't argue or defend yourself.
I haven't come to aid.
A rumor is most of the time something that will not help you at all.
I can however help you sway,
And maybe turn a head.
A rumor may sway or turn people's head by changing their opinion about somebody.
I can be loud, I can be sweet.
A rumor can be spread by everybody or being insidious !
But I do not speak.
The rumor itself do not speak.
Made for seeing, I don't see.
I don't know for this one :/
Attention's what I seek.
A rumor's goal is definitely to spread and to get the more attention it can.
While to you my pretty case I wish to submit.
A rumor is a matter of discussion.
My relatives do love to bind.
Bad reputation and gossips, rumor's best friends, will be bind to you and you will not be able to get rid of it.
But I will never commit.
A rumor never commits its peddlers.