You either had anger issues as a kid or you simply spent years throwing stuff. You get the following:

Ability Score Increase. Increase your Strength or Dexterity score by 1, to a maximum of 20.  

Multithrow. If you take the Attack action and make at least one ranged attack using a simple weapon with the Thrown property, you can use a bonus action to make two additional ranged attacks with simple weapons that have the Thrown property.

Returning. Simple weapons with the Thrown property that you are proficient with immediately return to your hand after you make a ranged attack with them. You can make additional attacks with the same weapon during the same turn.

Quick Hands. If you have a free hand, you can draw up to two simple weapons with the Thrown property without using an action.