Sebani the first order of business is to change your own perspective about yourself..body/tummy included. Think positive, not dreamyland,...be realistic but positive. Send your body, yourself uplifting and encouraging thoughts as well as disciplining thoughts...because in fact that stomach area is simply a manifestation of the inner you on some level.
You are only 16 years old!...advice to you should have taken this into account as your body needs are not the same as someone over the threshold of puberty. While you share an challenge similar to many adults...you not them are in the middle of puberty; body changes, and fat or weight is not uncommon for many teeagers...especially in a time and era of junk foods galore. Several years from now you could look a lot different. There are those very skinny kids but also at teen years theres still a lot of baby fat for some kids and for females that fat is there as a part of the hormonal and health process. On the other hand, if you can find out...is weight a hereditary issue?. If you can, ask your elders if they have had the same experience at teen years with stomach area fat?.
10mins every other day may be too little excercise for you. You didn't say if you do...but how about sports, dance, yoga classes (if you have someone that could pay for these for you), martial arts....get your entire body moving in active and healthy ways. Have fun

.....IMHO unless you are gravely overweight or special case then at 16 years old weight training and/or fastidiousness about calories and such is overkill, uneccessary and counterproductive..especially unsupervised.
Try not to eat fattening foods, have a limit, don't go to sleep with a full stomach...have at least 2 or 3 hrs between your last meal and bedtime. Don't drain your kidneys...but are you getting a least 2 liters of water a day?. Some people need or have more water...but thats just a basic guideline..you'll have to work with as per your own needs. Get fresh veggies and fruit in your diet as wel as fiber..proper or often enough elimination is also key. Often eating too many carbs will be stored as fat around the belly....but you shouldn't cut the carbs out...observe your body...your diet and see how it reacts.
Watch that you keep your weight in check for your height and body.There is a range of weight gain and loss we can all play per our age and health factors and that range changes over time for some but whatever it is..it is our parameter of self control.
While its helpful to learn from and about adults fitness..etc...find fitness magazines, articles, sites, books that are geared to youth fitness and health as well. ab excerices like cruches are fine but too much focus on them or not enought diversity can pump those abs out unattractively as nice as ever.
Try these excercises standing up straight or as advised for
The Stomach Lift, Abdominal Lift
articles
Kylee