Teen with a problem!

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I am fairly new as I started gave up and have now started again. I am a 16 y/o black British female who when started weighed 244 lbs and ranging from size 18-22 at 5 foot 5 but have no scales at the moment so cannot give an update. Im always been overweight and all the girls on my maternal side are while the boys are all stick thin. My twin is a size 14 and a few inches taller so is better of. I hoping to be that size or at least start off by getting to 190lbs. Really need support and inspirational people to help me through this as I have no big friends. Thanks