You don't want to be a brick ****house - you won't, unless you train for about 20 years and take testosterone/other drugs.
Girls basically just lack the hormones to build substantial amounts of muscle, so even if you trained correctly, ate correctly, and spent years working out, you would still never look like a bloke.
I always see girls at my gym using the machines, but make sure if you're gonna work out do it properly - so many girls will sit on a machine, stick it on a really light weight and then do about 20 reps very easy and think it'll "tone" them - complete rubbish, this does absolutely bugger all for your muscles.
You need to train the same way as blokes pretty much, and like I said, don't be scared, you won't turn into some muscle bound freak as already mentioned - due to hormones.