What's wrong with my Honda accord?

I have a 1990 accord, I don't know much about the car. A week ago, I stopped to get gas. After I pumped up, I got back in and started it in neutral. But when I would try and put it into gear it wouldn't go. (My clutch is pushed in) if I push hard enough it will grind the gear. So, I turned the car off. I start the car in first gear and it'll run but as it's moving the clutch smells like it's burning. After about 2 hours of sitting in the parking lot. The car worked. I got it home. The next day it did the same thing. It's kinda random when it will work.

It sounds as if your clutch isn't disengaging all the way. It could be something simple like air in the hydraulic line. It could also be it's having a failure of either the master cylinder or the slave cylinder. First thing is to check the fluid level in the clutch master cylinder. If it's low you most likely have a leak which is most common at the slave cylinder. You could add fluid but it would still need the system bled after the leak is fixed. Quit driving it till you find and fix the problem. If you are smelling the clutch disc burning you're only going to make things worse. Right now it might be a fairly cheap fix, but if you burn up the clutch is going to cost a bunch to fix.