As a child it never occurred to me to comment on anybody's size. It was considered rude in fact. Their size didn't define them but their actions did.
In our modern society there seems to be an obsession with size. You never seem to be good enough or reach what is basically an illusion of what the media see as perfection. The result is often a poor body image and low self-esteem. Whatever size you are isn't really the issue. Good health matters most. Your happiness too is important.The basics of eating a real food rather than a processed food diet, exercise, building high self-esteem and confidence is a more balanced way no matter what your size. If you are not happy with your shape and size and it's causing health problems then perhaps you need to consider a change. This really is up to you! No one can do it for you. Your body type will dictate to a certain extent your basic shape. A pear will always be a pear but can be well toned with exercise. You can make the best of how you are rather than long for impossible airbrushed illusions! Then you will find once you accept that changes happen naturally. When you change you may find other people are not so supportive especially if you achieve what they want to do but don't! Your health and happiness are more important than opinions however.