If you never had sex like nothing at all! Do you still need a pap smear? I'm 20.

No. The most current recommendations are against screening women younger than 21 years old - regardless of the age of sexual initiation or other risk factors.
Nver had sex pap sme. If you never had sex and have normal periods and have no other problem then you really dont need a pap smear.But having said that you still need to have a gun pelvin exam for routine physical exam to rule out any other condition.You should be examined once a year when you have regular physical.