My grass used to be green but now it is starting to look brown. I water it everyday....I was thinking that maybe I am cutting it too short....

Watering it doesnt hurt. Or adding fertilizer - if its too hot, use granule fertilizer.

add some lime, and keep watering.... and like they said raise deck

Keep watering it...and try raising your mower deck because you could be mowing it to short. We were doing this back last year and we raised our deck and at first it looked like we hadn't even mowed because we're use to it being short, but we are now use to it and it looks nice! =o)

Definitely leave it longer: doing so has the added benefit of helping to prevent weed growth!
Continue to water, and at this point, do NOT apply weedkiller or fertilizer---they could further fry your grass.
If your grass is turning brown in patches (rather than its overall appearance) there could be a grub problem.

you just might be cutting it too short. Try raising your mower deck and see if that helps. Good luck!

There are several things that can cause your formerly green lawn to turn brown. Lack of water, like the situation we have here in the southeast, can do long term damage. You might not recover from drought. You would have to sow grass all over again.
It could also be that you are, indeed, cutting too closely when you mow, and it's damaging the grass. Try setting your blade higher to see if that's your problem.
The third thing that I'm thinking could be Japanese beetle infestation in your lawn. They cause huge brown spots in the lawn that make no sense if you don' t know what is causing it. It looks like just odd spots of your lawn is croaking for no reason that you can see. You might need to put down the crystals for them on your lawn and see if that's it. Once they hatch, they eat the lawn from underneath the soil, and when they are grown, they eat everything on TOP of the soil!
Hope you find your problem, and happy gardening!

Water less often but for longer periods to encourage deep roots, and cut it taller. Consider replacing all or part with less demanding ground covers.