Fear of the Flap

My fear is that after I lose this weight I will be left with flappy arms and a flappy belly....saggy skin left from weight loss. Just one big ole flap on my stomach..... I feel SO SILLY even asking about this!
I'm 28 and have been overweight almost my entire life. I hit 303 in February and am now in the 240's. I have lost the weight solely with diet and exercise. I take a multivitamin daily and a biotin supplement when I remember. My goal weight is about 150, which is in the healthy range for my height and frame.
There is a woman at my gym who has major flaps...I don't know if she had a gastric bypass or what and I'm afraid to ask her because I don't want to offend her. Every time I see her I get scared.
My body is changing, definitely, but I still have back flaps, flabby arms, and a hanging stomach. My legs look smaller, my stomach doesn't stick OUT as far. My boobs are smaller too :(

Any advice or words anyone can say to keep me from worrying would help. Thank you.

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