Okay...then the suspicion is that the actual clutch is not disengaging even though you've pulled in the handle.
When you have the handle pulled in can you feel tension in the cable? Can you feel the clutch spring pulling against your fingers? If not, then you surely only need to adjust and tighten the cable. Even if you can feel that spring pulling back, you might still need to adjust the cable.
One thing you might do is to lift your rear wheel off the ground, then reach down to the clutch lever. We're talking about the lever that is mounted on the top of your crank-case (nearly on top, anyway) that the cable hooks up to.
Push that lever toward the pedal chain as far as it will go and then see if your back wheel turns freely. That would at least establish the fact that the clutch is engaging and dis-engaging.
Also, there are folks here who can help you more than I can. They'll find you before too much time passes.
Good luck.