What was your motivation to lose weight ?!

I think you might be getting a little mixed up with what you want exactly. You say that you want to lose "weight" but that means you might want to get rid of some muscle too. You then say that you'd like to "shape" (I'd call it tone) your body a little which implies you want to build some muscle. I'm not trying to pick at your question - I just want to clarify the point for you.

To answer it in the best way, I am going to look at it as if you want to get rid of fat AND build muscle at the same time. If you're looking to "trim" and "tone" your body, and espectially because you suggest you are not that overweight, I would suggest you start performing more intensive aerobic exercises such as jogging. I wouldn't think you need to change the whole way you eat or go on a diet because if you're wanting to build muscles - it's better to do it all with exercise.

Exercises like jogging won't exactly "build" your muscles on your stomach but they will help reduce the extra fat around there. Depending on how fit you are, you should go on daily or bi-daily jogs of around a mile. To build muscles, you should concentrate on anaerobic exercises such as sit-ups to help build muscles.

These muscle-building exercises will give your muscles the toning and training they need to grow and become more prominent. To start to see a real difference with sit-ups, you should be looking to do no more than 100 every day (more than that will often hurt your muscles).

If you stick to doing those two forms of exercise - jogging and sit-ups, you should see real improvements in a week or two. Remember, you should do them as often as you can (I.E every single day).

Good Luck and Take care :-)

Try jogging for about 4 times a week. and do this for 2 months. Make sure you stick to it. Once you see the differnce in your body, trust me you will want to continue losing weight.
I am joining the military, so that was my first motivation, but now since I've been working out for about 2 months now, I see the difference and want to just continue doing what I've benn doing and get in shape.

Eat five or six small meals or snacks a day instead of three large meals. A 1999 South African study found that when men ate parts of their morning meal at intervals over five hours, they consumed almost 30 percent fewer calories at lunch than when they ate a single breakfast. Other studies show that even if you eat the same number of calories distributed this way, your body releases less insulin, which keeps blood sugar steady and helps control hunger.

The best motivation is to stop focusing on weight loss and start focusing on being healthy and fit! forget about the numbers.

my motivation came from my desire to fit in my fav old jeans! :P