Mate, pop the bonnet and check nothing is in the way of your shifter first.
My oil breather found it's way in there once and I couldn't get into gear. I chopped the plastic pipe down and re-fitted.
The clutch switch is like a bonet alarm sensor looking thing. Like a thumb trigger.
Undo the plug, screw the thread into top of pedalbox (Clutch) and re-plug it back in. Cant see it being this though.
Take it down to the clutch place and ask them to check it out for you (If you can get there)