I lost weight playing DDR when I was in high school. Great game!
Don't kill yourself going on SUPER STRICT diets - those never work. What do you eat for lunch? Eat that, but only eat half as much. Do you drink soda or juice or anything with calories? Swap those out for tea/water.
Some people find that IF (intermittent fasting) style eating suits them better than the 3-squares or 6-mini-meals ways of eating. All the calories for the day are packed into a "window" of time, e.g. only eating between 12-6 pm. It's easy to use the "well I need breakfast" excuse to eat extra stuff you're not even hungry for/didn't eat before if you skipped breakfast.
As for exercise, anything is way better than nothing. You say you like clubbing? Dance around for half an hour and go for a powerwalk every day. There are plenty of DJs who release their own homemade megamixes for free (and legally) on their websites so you won't have the "my music is boring" excuse. If that's not enough to get you moving, decide here and now that you are not allowed to shower or bathe unless you have just exercised. It sounds bizarre and extreme but it's worked for me - haven't had more than one sedentary day per week in months and months.
I completely understand the "I need to lose NOW" feeling. Stick to a plan for a couple weeks and you will REALLY feel the difference! Good luck, you have the power to be the change you want in your life.


And I finish every time.