95 manual Honda Civic clutch problem

Could be several things, like the clutch/clutch pressure plate/throw out bearing, clutch master cylinder, leak in the lines, air in the lines, low fluid, clutch slave cylinder. First I would check the level of the fluid, which is right beside the brake master cylinder directly above and in front of the clutch in the engine bay. If everything is good, try bleeding it, which I would only recommend if you know how to bleed brakes. If all else fails take it to a shop and you could pay anywhere from 50-500 bucks roughly depending on what is all wrong.

I had the same thing happen to my manual '90 Accord-- I wasn't able to put the car into gear no matter how far I pushed the clutch or how long the car warmed up/had been driving. It even happened a few times while driving. I thought the whole clutch had to be replaced, but what ended up happening was there was air in the lines and it had to be taken in to the shop and the clutch lines completely drained. I wouldn't suggest doing this yourself-- it took two times by the mechanic to get it right. I paid about $400.