First of all, you must share your past and feelings with your wife. If she's the right one for you she'll support you until the end. You're partners in life, when one of you falls down, other one is supposed to help him/her get up. I'm sure your marriage bond will be stronger when you open up your past to her.

Talking from my experience, I strongly advise you to take up some sports or martial arts training. Not to beat some bullies up, but to empty your mind and get rid of that stress clogging up your spirit. Sports also helps with low-self esteem as you will be able to see yourself making actual physical progress throughout the experience.