You are not anyone else you are yourself. You need to remember that, especially once you start weekly weigh ins. No matter how much or how little you lost this week every ounce is one less than the week before. Every loss is to be celebrated and an encouragement to lose more.
You also need to remember that you are not your friends or anyone else. I am 5' and my ideal body weight is 97 to 127 pounds. My 6'4" friend has an ideal body weight of 156 to 204 pounds. It is not only unrealistic, but dangerous for her to try to be the same weight as me. She will never by my height, why should she be my weight?
Research your ideal body weight and figure out what your comfortable weight is between that number. I am most comfortable between 110 and 115 pounds. You might be more comfortable at 100 pounds or 120 pounds. Figure out what feels best for your body.
No matter what, be objective and be kind to yourself. Your goal is different that anyone else's and you will reach your goal when you get there. Just continue to work towards your goal and celebrate every step you take to get closer to it.