[RepublicnSlayer]

Try sending a voice message to someone and then play it back to yourself to see if is your mic, if you can hear yourself your mic is working properly and it has something to do with the game.
If you cannot hear yourself change you voice output (via personal settings) to speakers and see if you can hear yourself though your tv or sound system. If you can it is your headsets speaker that has gone bad...that happend to me 3 or 4 times!!!!