Re: need advice please !!
Oh my dear, 139 pounds on a 5'5" frame is most certainly not chubby. In response to your final question, an ideal weight for you would be one at which you feel healthy (which it seems you currently do not) and one which can be sustained long-term without making managing your weight a full-time job. My congratulations for having made such remarkable progress from 208 pounds. Be proud of yourself. A few years ago, I lost a bit of weight on a similar diet to the one you describe (went from 131 to 113 pounds on a 5'3" frame). This was achieved not by eating very little food, but by eating low-glycemic foods (mainly fruits, vegetables, lean protein, and a few unrefined carbs).
The low-GI diet I followed gives a healthy weight range for someone of your height as 114 to 144 pounds. Whether 120 pounds is achievable (or even desirable) for you, I can't say. If the "55" at the end of your name represents your age, realistically you should probably aim for the top of the healthy range for your height (the 138 pounds you already are) instead of the 120 pounds you'd like to be.
It's commendable to use Michael Jackson as an inspiration for your dancing -- an excellent exercise for both the body and mind. But, don't let him become an obsession, or allow trying to emulate him result in unhealthy lifestyle practices. Try to avoid weighing yourself every day -- once a week is more than adequate. Most people's weight fluctuates by as much as a couple of pounds from day to day. Judge your progress by how you feel.
I'm hesitant to raise this issue, but here goes . . . You mentioned not knowing under what subject to post. May I (kindly) suggest you take a look at the "Eating Disorder Recovery" message board. You might obtain some excellent advice there.
With reference to your chronic fatigue, it is possible that with a bit more food, and a bit less exercise, you'll start to feel less exhausted. Take care, Isabella. I bet you are lovely, just the way you are now.