My car wont go into gear

I have an 2001 Infiniti G20 manual and it wont go into first or second gear. It will go into 3rd, 4th, 5th, and reverse. But I tried to turn the car off and on, push and release with the clutch pedel...nothing. It started happening 2 days before it completely would not go into first or second. Do any of u know what this problem is. Im not sure if its the clutch or something with the gears. Plz HELP!