Misdemeanors are a black mark on your record that can prevent you from getting jobs and getting accepted into schools. There are ways to clear your record and, in some cases, that will allow you to lawfully say you have never committed a crime.
Once committed, a misdemeanor stays on your record forever. Most states allow exceptions for misdemeanors committed by juveniles. They destroy these records to allow the individual to enter adulthood with no legal burdens.
There is an option called "expungement" that seals or destroys your record from the general public, allowing you to lawfully state on applications of any kind that you have never committed a crime. The terms and qualifications for expungement vary by state, but, generally, they are granted if the individual has only committed one misdemeanor that does not fall under the category of a sexual offense.
Each state has different rules and regulations regarding expungement. Understand the rules in the state where the misdemeanor was committed. Expungement lawyers are available if you need additional advice.