A stiff pedal is a sign of a worn clutch. My 1997 with 67,000 miles on the original clutch almost took 2 feet to push the pedal down. Clutch was worn down to the rivets. With the new clutch I can press the pedal down with my thumb.
Some get more miles than I did. Some get less. Depends on how the car is driven.
I would say you are due for a clutch replacement. Bring it by a shop and have it checked out.
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