How do I get them to change!??

Why do people judge others by the colour of their skin, sexual orientation and language they speak or what country they are in??

I realy hate it. My mum and dad are both very very racist andi’m not! I’m am totally sick of it!! They know I h8 it and do it all the more. I’m 15 and at school I have m8s that area different colour skin to me and some that speak other languages!. Like we were watching a tv programme last night and itswhere you hve to split or steal 10,000 pounds and there was a white woman and a coloured man!. And my dad said oh the black person will stael it. They are all the same then ni**as. And I sed I think they will both split but the white woman stole and the coloured man split and he still didn’t stop. It upsets me sometimes because its such a big problem in the world today!! How can I get my parents to realise everyone is the same no matter what th ecolour of their skin, languae or sexual orientation is!!!? Oh yeh and my boyfriend is black and I’m pregnant by him!! They know I’m pregnant just not by a coloured boy. They think its just someone we met on holiday 4 months ago so I need them to change their mind in 5 months!!!please hlp!!?