All of the previous answers likely meant well but were all wrong (and also partially right).
To lose weight, it is as simple as eating less, yes, but caloric restriction leads to a type of survival mode called the anorexogenic cycle where everything you eat is stored in your fat cells so you GAIN FAT.
Exercise has almost nothing to do with significant fat loss and results in muscle gain, thus INCREASING YOUR WEIGHT.
Not so simple.
It's not your fault and you aren't going anything wrong ..knowingly. What makes fat is overeating. but what makes you overeat is constantly being hungry.
Everyone has a hunger off switch, but bc you eat sugar regularly, yours is disabled.
Stop consuming sugar and other sources of fructose like HFCS, honey, nectar, juice, molasses, maple syrup and white flour products (most breads, crackers and pastas) and your hunger switch will turn back on and 80-90% of the fat will disappear.
There's more, like alcohol, trans fats and BCAAs,
...but the fructose in sugar is the biggie for most
It took me 4 or 5 weeks to lose 25lbs OF FAT. Exercise will expedite your results as burning more calories will burn off the fat, but your body CANNOT burn fat until you fix the switch.
If you would like details on what I wrote, read the book "Fat Chance..." by Dr. Robert Lustig M.D. and/or watch the video on YouTube "Sugar: the Bitter Truth "
Pay it forward.