Do you follow a routine? Or do you just do what feels good that day? Like X said, Squat a shitload.
I usually do 50 pushups in the morning with a little rest (sometimes If I'm not feeling like a lazy bastard)
Just because you bench doesn't mean you only use chest, (Barbell) benching invovles traps, shoulders, triceps. If you're only benching and not including those muscles then you're not going to get stronger. Do power cleans, lying tricep extensions, chest sup rows.