Teacher of ethnic minority

Hi guys, so I am going into first year of uni to study chemistry with a PGCE to become a chemistry teacher, but in the future when I gain more experience, I would like to become head of department and possibly deputy head. However, I have heard that it’s actually difficult for ethnic minorities to move up and progression onto these positions. Can someone explain to me if it’s true and why and can u also give me an explanation about if being a teacher is actually worth the pay like what is going on in the teaching industry?

I can't answer the question about ethnicity but can tell you that I know Head of Departments and senior leadership people who come from ethnic minorities. One of the lovely things about teaching is that it generally takes the openness of recruitment quite seriously and as such it tends not to favour promoting people on a nod and a wink like in other career areas.
As for is it worth it. Well, if helping others, working for a greater good and doing your bit for society are part of who you are then yes, it is a superb career. You are helping train and influence our youngsters to fulfil themselves and their future. Sure, pay is not great but give me a job in teaching any day over earning double in a soul destroying career that cares not a jot for who I am.