My parents living togerther always figthing i feel guilty for not helping to them! what can ido !?

The remorseful feelings you have about your parents troubles are normal. Children which grow up in dysfunctional atmospheres, such as the continuous parental arguing that you describe, always feel the guilt. But as another has said, it's not your fault and...unfortunately, there's nothing you will be able to do to help them except continue to give them your love and respect. And other wise...stay out of it.