You Let a Few Negative People Sabotage You
There will always be some people who will be critical and negative, no matter what you eat or look like. They will find dozens of reasons why you can't lose weight or be healthy, implying you don't have what it takes to succeed.
Most of the time, this is because they lack self-confidence, they failed at the same venture in the past, or they feel challenged by your dedication and don't want to have to question themselves about their own weight.
Don't let them sabotage your efforts. Instead, try to surround yourself with positive people who will be supportive and cheer you up instead of dragging you down.