Why won't my car go into gear from neutral?

I have a 2002 Honda Accord with a manual transmission. Before any of my problems began, my clutch was perfect, and I was going to need to replace my catalytic converter soon. Anyways, I had my car parked and unused for 2 weeks while I was away on vacation. During those 2 weeks the car was never driven or even turned on. Today when I went to drive it the car struggled to turn on (as I already expected because it hasn't been driven in so long) once I got it started it quickly turned off but on the next try it stayed on. (success!) So I went to drive away and I took my car out of 1st gear, the gear I park it in, and I attempted to put it in reverse but it wouldn't budge… The car would not get out of neutral once I put it in. It wouldn't even let me return it to 1st gear. Help!

I don't know if this is what happens to manual transmission cars after the catalytic converter goes, I know on automatics the car won't even move once that goes. Is it even possible for the catalytic converter to go while the car hasn't even been driven in so long?

The cat has to do with the exhaust and nothing to do with the tranny. Something went bad on your clutch or tranny. If it goes into gear when you have the engine off, which i should. Then it's the clutch. But if it doesn't go in gear with the engine off or on. Then your going to need to get the tranny looked at.

Does your clutch not fully release? Is it a cable operated clutch?
There should be an inch or less of freeplay at the top of the pedal.
if its cable, you can adjust it, if its hydraulic, you can bleed it.
both can be done standing by it with the hood up and the pedal must be held down if hydraulic.
If the disc is stuck, shut it off, pick a gear, depress the clutch,
start it, let the clutch up.
If you can't rock it, roll back or forward, try other gears and get the clutch to come free, it may have already scattered the disc.
I have seen this on both honda and acura. Two pees in a pod.

The friction layers on the disc just come delaminated from the metal center of the disc.

"We make it simple" Yeah, Replace every dam thing.

Hi, check the fluid in the clutch it might be low not letting the clutch work properly