Hard to press cluch pedal?

I am 19 years old and i got a Celica GT 2004 some months ago. Before that i had a Corolla 2000.

Recently i had to drive the Corolla to the scrapyard and i noticed that it was really easy to press down the clutch pedal. It's not like that in my Celica, it's somewhat harder to press down the clutch, in general.

Do any of you know why? How is yours compared to other cars you have driven? Do any of you have any suggestions or a solution of what to do? How to adjust it or whatever?

The car has driven 170 000km.

Sorry for my bad english! Just ask if you need more info, etc.