Having the opposite problem, I am probably the last guy to give any sound advice to losing weight. I have been trying to gain weight until I hit my thirties. I got depressed when girls that got comfortable enough to tell me how much they envy my weight and how I could eat anything. Maybe, if I was a girl, it would be great, but since I am a guy, not so much. My eating attitude was that I hated to eat. I would get tired of chewing, ate slow, and lost my appetite fairly quickly if like everyone else was done, I was done even if I barely touched my food. To give you an idea where I was, a six inch Subway's sub would make me full. My stomach size now is at a foot long Subway's sub and a bag of chips. I gained 30 pounds, finally.
I have had friends who were really overweight. Two were XXXL in shirt size at around 5'9" in height. My other friend was around 6'3" and was way over 400 pounds so much that, his knees were bad because of it. One of them decided to get surgery to cut a portion of his stomach out, another decided to take the Lap-Band on the top portion of his stomach, and the other did it naturally.
We all lead to two things, stomach size and willpower(somewhat). My friends all had the stomach size to eat a whole large pizza to themselves in one meal. They could eat +8 bean and cheese burrito from Del Taco by themselves in one sitting on a constant basis. Your stomach has the ability to grow or shrink. If you eat a certain amount of food, three meals a day on a constant basis with no not enough amount of activity to burn it off, well, see where that goes. The one that did it naturally, cut his intake by about 25% less. He substitutes beef for chicken. He goes for walks for a regular basis. He lost about 10 pounds in a month. I asked him how does that felt. He said hungry. He is hungry all the time, but after about a week to a week and a half, hunger pains went away. He felt full at eating at 25% less after awhile then he ate 25% less than that. Hunger pains again, like last time but he kept his mind on doing something else and he adjusted fine. It has been a year on this course, he has lost 185. He wears a XL now. He eats less than me and is comfortable with that portion. Great thing about him though, I have known him for like eight years, never had a girlfriend, but now, he does(I knew he had it in him).
The other two that had surgery, lost alot of weight really fast. The friend that had a portion of his stomach removed took the longest time to recover(about 6 months). He was suffering. He was always sick in the stomach, always tired, throwing up, and he couldn't do anything. The Lap-Band friend took about a month to recover but same symptoms as the other guy. Their body had to adjust to that drastic change and that's the hard part, but they are alive and eating way less now though.
Last but not least, maybe get your mom involved to help you lose weight. But this kind of help can be a double edged sword. Some people may push to the point in making the person they help feel bad which could lead to depression then more eating, a rebellious feeling. Just be aware like you are aware now of your weight to tell her how you feel if she is making you feel bad and how that is not helping. They are trying to help after all, just using the wrong tool.
P.S. SORRY FOR THE LONG POST. This is my ADD version and it is still long.