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i wouldn't say you're fat or obese but you're pretty big. i wouldn't say aim for 188 but maybe 200, 210 if you lift weights.
Ok so 210 is probably a more realistic goal not 188. Thanks 
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Just go to a gym. Who cares how much you weight. That's completely irrelevant. What's important is how you feel, and the actual physical condition of your body and its parts. There's absolutely no reason to concern yourself with a worthless numbered measurement such as your weight. Unless of course, it restricts you in some way or in some daily activity of some sort.
Good luck. BTW, if you're satisfied the way you are now, just stay the hell like that, no reason to change unless you see yourself putting on more and more weight and are unsatisfied with it. What if you were 6'3 and 300lbs? You could be very muscular, and not be "over weight" at all, yet still be 100lbs heavier than the average guy your height. If you have some excess fat (it looks like you might, but it's impossible to judge by pictures), just run for 10-30mins (starting with less and building up each day) and it'll all dissapear. Fat doesn't way that much, anyway.
OH, one more note: diet is very important. Pay close attention to that if you want to ever have a chance at losing any of that weight.
-RSI