I want to have my secondary school bullies beaten up by a thug
Why would you want to have people beaten up?
I want to teach them a lesson they won't forget.
You are being vengeful and nothing good ever comes of that. You are seeking revenge and it is best to move on from this situation that was in the past. Getting revenge will only create a larger problem because they could come after you again.
I hate how they messed with me when they had no right to, they deserved it. They weren't being violent towards me but they always made fun of me, they needed to be taught a lesson
I don't think it's up to you to teach them a lesson. You should call authorities for help instead so they can stop bothering you.