Replying to Weight Lifting

Hey, i know this might not be the best NS question, but ive asked around and searched online, but still havent found any good information, so i thought id try out NS. I go to the gym 3-4 times a week and have been on and off since about october. No matter what i do and how many different exercises i do i dont get bigger. My sats have gone up but nothing great, my bench is 205 and i do alot of other chest exercise, but i cant get a bigger chest. Anyone have any ideas, im open to supplements, but not sure if i feel like it, i did creatine a couple years ago back when i played hockey and football, but all it gave me was the shits, no results.