[SOLVED] [HELP] Everyone can hear my system sounds, while my headphones plugged into the front panel

[accmedia3]

So i have an issue, which makes my friends can hear all my system sounds on my pc. I have sennheiser headphones, and when i plug them into the front panel of the computer. It doesn't happen with the back panel though. How can i solve it ?

 

[tennis2]

Just turn off or mute your computer speakers when you're using your headphones