how get a misdemeanor off my background

It depends on what happened to your case.  If your case was a misdemeanor and it was done a certain way, you might be eligible for a Non-Disclosure.  If you were never convicted or given court-ordered community supervision (probation) you might be able to get an expunction.   You need to get a certified copy of the court's filing and have an attorney look at it for you to determine what you should do next. Patrick Short