The thing about overt sexism and racism “phase” is that, it’s not a phase. It never is.
Sexism and racism are systems. You adhere to them. You now believe that women and black folks are inferior to you. Because you’re a teenager and that those years are fundamental, you’re now fundamentally thinking that you’re probably right. It’s anchored in your brain and you flutter around those rancid concepts, which are syncing well with what bell hooks calls White Supremacy Capitalist Patriarchy, aka our society.
That’s not a phase. That’s how you’re thinking now and until something very powerful proving you wrong happens, forever.
So saying “I’m sorry, I was young(er)” later, is some PR bull. You probably still think the same, only now you’re quiet or forced to be.
And none of that is great. None.