First, kudos to you for wanting to fix this issue.
The issues behind weight problems are more complex and convoluted than is generally believed, so don't let people judge, bully, or ridicule you.
There is a phenomena called the "double burden of malnutrition," which I believe that anyone trying to lose weight should be aware of. See below:
EN Nutrition - Topic - Double burden of malnutrition main page
www.who.int
There are a lot of "common sense" beliefs about obesity that are simply wrong . . . just like the common sense belief from centuries ago that the Earth is flat.
There is the idea that an obese person need only practice restraint in eating and exercise a little more, and the obesity will get fixed . . . and this isn't always true.
There are, for example, families in places like Brazil and Africa where there are obese parents and starving children in the same household, yet the parents are eating much less than the starving children.
Also, there are many instances where people have starved to death during a famine or while imprisoned in a concentration camp, yet they are still obese.
Evidentally, this has to do with genetics, hormones, and so forth, so the obese person should be viewed as someone with a medical condition that needs to be worked on by a doctor, and not as a person who "lacks the character and determination" to "do the right thing" and stop eating.
As for me, I believe that this kind of obesity has it's origins in our evolution.
In ancient times, food was very plentiful during certain times of the year, and scarce or absent during other seasons (like winter).
Many animals go through hormonal and metabolic changes during certain times of the year. Bears put on weight for the winter, dogs shed their summer coat and grow in a winter coat, and so forth.
With hundreds of thousands of years during an ice age, it would surprise me if people didn't evolve certain hormonal and metabolic mechanisms to save calories in reserve for future scarcity, and that this mechanism can (and does) go haywire for certain people.
The polynesians, for example, had genes for obesity . . . which actually helped them explore and settle the Pacific islands. See below:
By studying the genomes of more than 5,000 Samoans, researchers have uncovered a single gene that boosts a person’s obesity risk by upwards of 40 percent.
gizmodo.com
So, don't let people judge you, and don't buy into any of the prejudices that your obesity means that you're "too weak to put down the fork."
See a medical expert, and follow their advice.