About 2-3 years ago, all my rear speakers stopped working. Only the front speakers worked; they sound awful alone. I noe i waited too long, but i was too lazy, and i dnt noe what the hec to do.

Why is this happening? I want my sound back

 

Pull your dash and rear body panels and jiggle the wires around to look for a short or loose connection.
If you don't find one then I think it's safe to say that your rear channel is out on your radio.

 

Where can I find the rear channel on my radio?

 

Inside the radio itself.
The rear channel, as with the front, left and right channels, are determined by a series of transistors, resistors, capacitors, modulators and various other circuitry that makes up the internals of the radio.
If you cannot manage to get the rear speakers to play after removing the body panels, accessing the wiring, jiggling it about a bit and looking for shorts or loose wiringm then it's time for you to do a stereo upgrade and/or get a new head unit... information about which is plentiful on this site and easily accessed with the "search" feature.
Good luck.