Bro, trust me. Start crosstraining along with your weight training.Cardio is VERY important in a fight!!!Start training in Kick Boxing, wrestling, Brazilian jiu jitsu. Find a MMA school or club in your area, keep lifting. And over time, after you actually become a good fighter, you wont want to fight anymore. You will learn humility from the real badasses in your fight club from sweating together, bleeding together and getting your ass kicked.
Listen, if you go off half cocked tomorrow and get your ass handed to you, it could ruin you mentally forever!!
Also, never fight when there are witnesses. Unless your life is in danger.