Not a lot of information to go by. Did this happen suddenly? Gradually? It could be a misadjusted clutch pedal/master cylinder actuator rod. Try pulling up on the clutch pedal to see if it releases. If not, locate the clutch master cylinder under the hood, or the slave cylinder on the transmission bell housing and loosen the line at the master, or the bleeder valve at the slave. If fluid comes out under pressure, check to see if he clutch now works. If it does, you have a pedal to master cylinder adjustment issue not allowing the fluid to return to the master cylinder reservoir.
If this doesn't help, you probably have a mechanical issue, like a clutch disk or pressure plate problem, or even a release bearing slide stuck. Good luck! Let us know iWhat fixes it.