Hey the PC players suck on the Controller, but the Console guys suck on the KB/M. I 'get' it.
That said, startup the game and under: Options / Controls / Gamepad make certain that it's Enabled. Also make certain that the 'gamepad' drivers are up to date and installed, and lastly that your 'Trust-GXT30' is indeed supported -- many controllers are not.
Most Xbox supported controllers 'should' work.