If your clutch is not slipping, it is not worn out. Simple as that. Generally speaking, a clutch has absolutely nothing to do with ease of shifting UNLESS the plates are dragging or warped, AND you are using the clutch entirely for your gear changes. Changing gears in a motorcycle transmission are all about taking pressure off the shift forks. For instance, if you put a little up pressure on your shift lever, and without touching the clutch, roll off the throttle for a second, it will go into the next gear like butter. Down shifting is a little trickier, and takes practice, but if you blip the throttle as you depress the shift lever, it will downshift the same way. My bike has always had slightly notchy downshifting by using just the clutch, so I use the clutch, but also blip the throttle as I downshift, which overrides the slight drag the clutch might have.