Sound isn't playing correctly

[agent_smith88]

Good afternoon everyone! i've been trying to figure this out forever and its still not working. I've got a Mac mini (mid 2010) as my wonderful computer, current mac client 3.0.13. I'm using my Razer Chimaera wireless headset for my mic and audio. When I plug in both of the 3.5mm jacks to my computer, whenever i talk to plays whatever is playing on my computer (i.e. if other people are talking, game sound, music etc) even though its all playing through my headphones and not my speakers. i've tried to use an external sound card such as the creative sound blaster omni 5.1 to see if it was just something wrong with the audio jacks on my computer but no dice it still has the same issues. Can anyone possibly help me?!