Deadly secrets and bad boys

I have a secret that nobody knows,
I keep my head down at school so my secret stays hidden.
Why I don't understand is that Nate the schools bad ass and biggest player found out.
How he found out you ask , I don't know myself, but I will find out,
I will do anything to have him not tell anyone.
I will kill people for him not to know, because killing people isn't a big deal to me.