Linking weight to self image has been a dangerous misunderstanding of basic biology. It makes as much sense as saying that one should have a body that occupies no more than 2.0 cubic feet.
If a person has self-image issues, then no weight is going to be the "right" amount, as the target level is a mental fiction that displaces the source of unhappiness to something that can be "controlled". And since the reasons for this lack of control (or perceived lack of control) are not originating in the weight of a person, it becomes a false target.
"Ideal" weight changes with activity levels, health status, and a person's particular biochemistry. Some people can gain weight (and transform the additonal mass to fat) with as little as 1,800 calories a day, whereas others can consume over 6,000 calories a day and not gain a gram. An ideal weight should be a healthy weight, in which the body has adequate reserves of energy stores, where all the biological/physiological markers are in the middle of their ranges, and when a person is capable of engaging in a moderate level of physical activity without strain.
@ Kazooie - from the other posts you've done, I have a certain image of who you are, and my advice would be to look deeply at your life circumstances and determine where you can excercise the control that you need. Those areas may be difficult to change, but in the end the result will be much more favorable to you than any attempt to improve your self-image through weight reduction.