Why am I not losing weight?

Okay well I don't know if you'd like to take advice from a 14 year old girl but I have recently lost 26 pounds all by myself!I was 5'3 and weighed 154, now I weigh 128! I was stuck at a certain weight for the longest time so, I had the same problem! First off you may have a slow metabolism. Some ways to speed up your metabolism is eat 6 small meals a day instead of 3 larger meals. Eating six 260-300 calories meals every 2-3 hours boost your metabolism because you keep intaking food, forcing it to work. Another reason why you might not be losing weight is because your body is so used to the same exercise. Try adding another half mile to your workout, it will make a difference. Also, sprinting really fast say for a half a mile burns the SAME amount of calories as running one mile, it's speed that makes the difference, not the distance. If you have trouble tracking your distance run on a treadmill (I personally find it easier than running outside). Last, but certainly not least is keep hydrated with lots of water! I drink about three or four water bottles a day. It flushes out everything in your system and cleans it! I hope I helped! Good luck!