Bree - You are right. Through weight loss, it is really important to work on your own head space and continually reaffirm what you are doing, that you are being successful for you, and not to worry about others.
I can remember a story that a colleague told me some years ago. She wanted to go back to university and complete a Master's program in education. The fad at the time was to tell everyone you possibly could about goals that you were trying to achieve. The philosophy was that these people would keep you motivated and accountable. WRONG!!!!!
She found that, by telling everyone, rather than a few select who would indeed be support, many of the people began to sagotage her efforts. She did not complete here Master's at the time because of the efforts of her "friends." She noticed that when she abandoned the degree, these people became happier with her once she had abandoned her education.
For me, this story taught me to share my goals only with the people that can be a support to me AND to watch for people who are more than willing to sabotage my efforts. In my weight loss journey there were lost of people who are very happy to sabotage my work. If you find this happening, then stay away from those people, or, if that is not possible, don't tell them you are losing weight. If they eventually find out that you are on a weight loss program, be aware of the tactics that they are using to sabotage, then have a plan on how you will overcome their efforts.
You will succeed, in spite of the naysayers. Just keep focused and visualize how you feel, the look on people's faces, how you will look, etc. when the weight is gone. Enjoy the whole experience and congratulate yourself on small victories. This is hard work and worth every bit of the effort.