1994 Other Saturn Models Hard/Impossible to Shift

I have to jam the clutch pedal into the floor and push really hard to get the car into gear. 100 miles ago it got harder to shift, but now it is sometimes impossible. First and second gear seam to be the worse, but all are noticeably more difficult (however, reverse is fine). Down-shifting is particularly hard. The clutch still seems to be engaging at the correct pedal level, I just can't seem to move the stick. All fluids have been checked and are at the correct levels. Do I need to replace the clutch, or is it something else? Thanks!