practice a lot. all of the above suggestions are good, but you need to physically strentghen your hand/stroke, which doesn't happen overnight.
nobody was born a good drummer, they just spend a lot of time getting that way. also you might pay attention to your bass drum - a lot of beginners have no strength on the bass drum pedal either - your body isn't pre-programmed to have your less dominant hand or foor hit as hard as another.
another old school drum corps geek thing we used to do they called "stone killers" which just conisted of 2 measures of 1/8th notes with your right hand, then the next 2 measures with your left hand, along with a metranome. so like...
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1 & 2 & 3 & 4 & 2 & 2 & 3 & 4 &
RRRRRRRRRRRRRRRRLLLLLLLLLLLLLLLL repeat ad nauseum
ah fuck, i can't figure out how to get it lined up right, but you get the idea...
it'd pretty unflattering to your left hand. with shorter durations on the left hand, the difference isn't so apparant. it's so totally uncool, but get one of those beginners stick control books and start learning the rudaments.
keep it up!