From what I see in the video, I think the best thing for you to do is learn to hone your more defensive aspects of the game.

1. Footwork. Footwork is an absolute beautiful thing. Watch Roberto Duran or Marvin Hagler pound the shit out of somebody. They have gorgeous standings when they do so.

2. Reflexes. Best thing you can do is see those punches coming.

3. Countering. There is nothing more important in the game of boxing, in my opinion, than using your opponents attacks against him.

4. Head movement. Very, very important. As a smaller guy, learning how to slip punches or dip under an opponents arms would be useful to you. I'd recommend watching Rocky Marciano fight to see a really good dipping technique.

Defense is everything. Get that squared up, and start having fun with Countering, and you'll be on your way to dominating offensively as well.