Oh man, 4 Krispy Kreme's would be showing
restraint for me, lol, I could eat a whole dozen in one sitting. (You know how most people get sick if they eat too much crap? I must have a stomach of steel... unfortunately.)
But seriously, the thing that has worked for me is really getting in the habit of THINKING about my food. If you're used to mindlessly eating whatever you'd like, it takes a lot of practice.. but if you have to really consider every bite you put in your body, it's easier to avoid some of the junk.
A lot of people find it helpful to write things down (or log them in an online food journal) BEFORE they eat them. If you had to update the number of cookies listed under "dinner" in your journal from 1, to 2, to 3... would you really make it to 7 or would you say "oh wow, that's a lot of cookies, I'm going to stop now!"
Why not start working out today? Heck, what are you doing RIGHT NOW as you read this? Could you go for a little walk? Do a few push-ups? What's the soonest you can go to the gym, or do a workout DVD, or go for a run, or whatever it is you plan to do?
March 9 is about 6 weeks away, right? If you worked pretty hard, I'd imagine you could lose 10 pounds... that would probably mean keeping track of your calories and doing lots of exercise. Even if you just lost a few pounds and gained a bit of strength and fitness, I bet you'd feel more confident and comfortable and enjoy your spring break more.