Can I beat up my friend?
Why would you want to hurt a friend?
It sounds like he signed up for it.
You should speak to someone about any violent tendencies you have. You should never feel driven to physically hurt someone for no reason. Hurting others will lead to you being incarcerated.
I'm going to go for it.
Violence is never a good answer. Don't you want to deescalate your conflict instead of making it worse?