Mean teachers need a new profession. If you aren't there to love and nurture as a good parent, find another job. That said, many strict teachers are the most loving and stable, there is a difference. The key is intention and if they have the capacity to care in a genuine way. Sometimes the more serious teachers are more serious about student welfare too. Heroes come in all forms. So, if your teacher is mean, tell a trusted adult and see if it can be figured out in a way that is good for you.