People will hopefully give you some tips that may or not work with him. In my experience this behavior only gets worse. Sorry to not be more encouraging.
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Let this one go..... you are just getting started, and a wicked rooster has ruined the whole chicken experience for lots of people.
Personally, I think that roosters that are raised with just flock mates, tend to get mean. Not always, but often, what happens is they quickly out grow their flock mates and get MUCH bigger than the pullets, and become bullies. People often spend a great deal of time with a small back yard flock, and roosters loose their fear of humans, so try and bully people too.
In a multigenerational flock, a rooster growing up is much smaller than the laying hens, those older girls are a lot bigger than he is and will whip some manners into him.
I often recommend when asked, just keep hens the first couple of years, get some experience under you, then raise up a rooster in the flock.
Mrs K
If you're bent on keeping him, look up user Centrarchid here on the forum. He has a method that he uses to break aggressiveness in roosters.