Misdemeanors can ruin your life as misdemeanors do stay on your record for life.
Although misdemeanors are less serious than other charges such as felonies the misdemeanor is still a crime you committed and it can make it hard for you to get employment if you have misdemeanors on your record.
Misdemeanor offenses are less serious than felonies but in the eyes of the law they are still serious breaches and unless you can get the misdemeanor off your record through a petition then it will be on your record for life.
The best thing to do is not commit any crimes even though it may not be as serious.
Even shoplifting and petty theft can affect your record and affect your ability to get employment, rent a home, apartment etc.
So do your best to avoid getting into trouble with the law which is better than having any criminal history even though they are misdemeanors.