Yep hydraulic clutch problem. But it may just be low on fluid. Raise the hood and on the drivers side close to the windshield mounted on the fender a container with a screw off lid that holds the hydraulic fluid for the clutch. Check that before you do anything else to make sure it has fluid.

I agree with above, the hydraulic clutch prolly need work (bleeding or replacment) if it's really bad it needs a throw out bearing or something internally which is not allowing the tranny to stop spinning. But I have a 98' ford ranger (pretty much the same truck) 4 speed +overdrive with 200,000+ miles and no issues...so I bet minor problems

Clutch hydraulics are probably starting to fail - If you can get it into gear with the engine off then it is definitely a hydraulic clutch failure and not a linkage problem.

Dragging clutch will cause this.

Its got fluid. So what would I have to do to fix it?

Hello, I own a 1997 Mazda B2300 standard transmission. When I come to a complete stop in neutral, I cannot put it back into gear for the life of me and its been getting worse. I don't exactly know what to do on this one if anybody can help?