I'm 5'9, 190lbs and 16 years of age. I work out every other day for 2 hours at school with a couple friends and right now I am benching 255lbs. I never do curls or any other workout besides the circuit training machines we have. I have a squat of 330lbs and unlike all of my friends, I do not take creatine or protein shakes before I work out.
Here is how I got to be lifting this much.
First, put 3 - 10lb weights on each end of the bench press bar. Have your friends stand on either side of the bench. Do 15 repetitions of this weight without stopping. Then after your 15th rep, hold the bar up with your arms extended for 10 seconds. Then have someone take 1 of the 10lb weights off each end. You should now have 2 on each side. Continue the process until you have gotten the bar down to no weight on it. After you complete your 15 reps and 10 seconds of holding, have your friends put a 25lb weight on each end. Try to do 10 repetitions of this. If you do, congratulations. Do this every other day while working out and you will find a significant improvement in your strength and benching abilities. This is what we call "The Bicep Burnout" routine.