It's a hydraulic problem.

Your clutch is not fully disengaging. I bet 90% chance it's your clutch master cylinder. You probably have air in the lines now making things worse. If you shut your car off, and can easily go through the gears with or without the clutch pushed in, then that's your problem. Check for hydraulic fluid on the slave, and inside the car at the firewall where the clutch actuator rod goes through the firewall. If you see any syrupy looking fluid at either location, change the part that's leaking. If you don't, check all the lines, make sure the clutch reservoir is full, and try to bleed it out.

There is nothing wrong with your clutch or transmission. Fix your hydraulics and everything will be back to normal.