Rocky2's got a point, making sure you're properly fueled for workouts can make a big difference.
Check your nutrition.
Check your form (do you know how to set up for a bigger bench? If not, look it up).
Get a routine, any Tom, Dick, or Harry can make-up some half-assed workout plan and get decent results, but why re-invent the wheel? Pickup 5/3/1 and just follow it, don't over think shit.
Get a spotter, seriously makes a big difference, even if they don't touch the bar. Helps with confidence in knowing you won't get pinned, lets you be more aggressive. Most folks who don't look like emaciated little girls are willing and able to spot you, just tell them exactly what you want them to do.
Once you do all that and if you're still not making progress then you're just a puss and you're not trying hard enough. I suggest knitting as an alternative.