Originally Answered: I get tired after riding my bike for about 10 minutes?
It is really great that you are recognizing a problem you want to fix, and I'll provide a lot of information if you take the time to learn.
At about 14, you may find it harder to understand the problems, and you have less control over your daily diet, so you will need to work with who buys and prepares your food, and always look at the choices available.
Now, about the bike riding or other exercise, the more you weigh, the harder it is to keep up activity. The good thing is that you burn more calories in the time you do it. Your body is not efficient, and also each motion, and your heart, has to work very hard to do things. You can slowly increase the distance and activity as your heart and muscles get stronger, but it is easier to do every possible about your diet which is what and how you eat, because that is most of the problem when your BMI(Body Mass Index) is over 25, and you are not big with muscle and bone. So, eating habits is #1, and exercise helps, but is #2. If able to lose some weight, the exercise gets easier, and you can do great things by the slow increase in biking. You just need some patience about the biking and other exercise, and some focus and help about eating right to get to a healthy weight.
This is about what and how to eat. If you don't like vegetables, you will never solve your weight problem, so try more of them, and find some you like.
I provide an ideal weight calculator, how to eat right, list of some food, and food look-up web sites.
It shows now, that your BMI is 30.4 against a healthy range of 18.5 to 25, and your ideal weight if your build is normal is about 145, so you have a long way to go, but it can be done with some patience and effort. At about 164 pounds, the top level of healthy in an average body build at your age and height, that is when you can make the most progress with exercise.
When losing weight, early pounds come off much faster. You have excess water weight in your system that has no calories to get rid of. That comes off as you start to do things right. You also have an excess of glycogen (body starch). That is 1,800 calories per pound. And, you have fat, and some is normal and good, because it hold more white blood cells, stores vitamins and minerals, and gives you energy for a long time, and it is 3,500 calories, but you have too much of that also, and it is slower to burn off. That's why extended time hard effort exercise does better at burning fat, but you aren't yet ready to do that, so first you have to lose water and glycogen and that is best and easiest with a healthy diet of 1100 to 1700 calories of food a day. The lower numbers work faster, but you really don't want to be hungry, so you have to eat a lot of vegetables and low fat and low calorie food.
You'll see here a lot of exercise and calorie burn. You will see that with more weight, you are burning more calories in the same time:
There is more complicated information about glycemic index of food which is how fast what you eat turns to glucose and then to glycogen and fat, and also you get hungry faster. Low glycemic index food is good. There is also about a very low carb diet, called Atkins or ketogenic, but that can make you sick. The safest is the healthy diet (DASH diet), that I show information about. but if you want to get really fancy, foods that are healthy for you, and low glycemic, like broccoli for example is really a perfect food.
I will show you the advanced information, but if it looks complicated to you, just ignore it:
and eventually, if you can get a a healthy weight, or just want to learn even more:
And, a nice web site all about tips in losing weight and what it is about:
We get smarter by learning, and then doing things right, we get smart and healthy, and with exercise, and the learning, you become smart, healthy, fit, and attractive. It will be easier for you, because as you get taller and grow, your weight targets go up. You can grow into your size, but that takes a long time, and you may never get big enough for 200 pounds to be healthy.
I hope I wasn't too complicated, but it takes learning to do things right and understand how and why things work the way they do.