i was driving my car the other day doin about 45 and when i went into fourth gear i heard a clunk and the clutch never came off the floor i got it home and played with it a little and it springs back but there is no pressure behind the clutch and my fluid is full what should i do??

 

It's probably the hydraulics. The cylinder can go bad and still not leak. Check freeplay. If ok, press pedal to floor and hold for about 1 minute. Let up and check freeplay again. If it increases, cly. bad. For the cost, and if they have not been replaced before, just replace master & slave cylinders, and flex line. Install and bleed.
Also when pedal pushed to floor, you might want to have someone look under the car to see if the fork is moving through it's full travel, or not.