Losing 66 at 21

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I've tried counting calories a handful of times before, but always end up messing up, usually on the weekends, and I just give up. This time I have decided to go all in. I currently weigh 200 lbs, which is far too much at my 5'2" frame. I am looking for friends on here to help motivate me.. I want to be able to see other's progress and have a reason to log into here, other than my own weight loss. I just turned 21, which is supposed to be my prime, but I don't feel like I'm there.