Ok. Before posting this I tried every solution already offered before (unless I missed something).
My internal microphone is not working. I tried silencing front right via pavucontrol, tried to define the input device as alsa through gstremer-properties, unchecked "allow skype to automaticly adjust my mixer settings", checked if the microphone was muted. I have no idea what else to do. any help would be appriciated. thanks.