I'm just angry

 

If you are looking for a subclass to make a barbarian that doesn't have any connection with nature, but is just really angry.... here is your way, hope I helped 

 

Boxer

At 3rd level, you gain proficiency in unarmed strikes that deal 1d8 bludgeoning damage that counts as weapon attacks for rage purposes.

I'm not stoping

Beginning at 3rd level, once per long rest if you drop to 0 hit points while raging, you can make a constitution saving throw with a DC of 5 + the damage taken, in a success you regain a number of hit points equal to half your barbarian level, rounded down. You can't use this feature if you dropped to 0 hit points from a critical hit. 

Oops I broke you

At 6th level, any hit against an object or structure is a critical hit, in addition once per turn when you hit a creature with a weapon attack you can deal an extra 1d10 + your proficiency bonus of bludgeoning, piercing or slashing damage (whatever your weapon deals)

Bring it on

At 10th level, while raging you can make a critical hit on a 19 or 20.

Come on, think on your feet

At 14th level, when you hit a creature with a weapon attack while raging you can force the creature to make a constitution saving throw, with a DC of 8 + your constitution modifier + your proficiency bonus, on a failed save the creature must roll on the effects table of the confusion spell on the start of its next turn. You can use this feature a number of times equal to your constitution modifier, you recharge all uses on a short or long rest.