Gear stick not shifting after start?

Civic coupe vti 1999.

When In off position, accessories and on gear stick shifts ok. After start really struggle to put in gears if I can shift to a gear at all.

Edit: ok so I have just found there was no clutch fluid. I have added clutch fluid and it has made a difference however it still does not go into gear smoothly and struggles at times, especially when goIng downhill, though clutch fluid has made a difference and it is shifting a lot better now.

I couldn’t see any fluid in the clutch container and topped it down however is it the case that maybe old contaminated fluid is further down and this is still causing it to struggle a bit.

Please help me, I’s my transmission gone?? What do I do now?

Thanks.