Some, because of a lack of opportunity, are unemployed.
Some, because of lack of proper attitude, are unemployable.
Growing up, or more accurately, simply aging, if you have been patted on the head and given a trophy for every modest effort, you aren’t going to understand a boss’s request to perform menial tasks without a “thank you” and “good job” every ten minutes.
You aren’t going to understand that, as a newbie, your suggestions may not be solicited or considered seriously. You are going to blame the mean boss. You are going to stomp your feet and quit. You are unemployable.