Gears Sticking?

I have a 95 GSR, and I've noticed difficulty changing gears the last few days. For example, when I'm first gear tryin to switch to second, I now have to really push it in whereas before it would ease right in without much effort. It does this on every gear change. Anyone know what this means?

i'm not sure if this'll help since i'm not that great w/ automotive stuff but that happened to me a few times.
The first time, I didn't have enough clutch fluid
The second time, the clutch fluid kept leaking so I had to replace my slave cylinder.