Archimedes makes some great comments.
One of the best places to start is by logging your food. You don't need to become obsessive about - measuring and tracking your food for just a couple of weeks can be really educative about portion control and where your calories are coming, and can help you identity areas where you can knock a few hundred calories off without feeling deprived.
1-2 lbs per week is a reasonable guide to weight loss when starting out. But weight loss does tend to slow down as you approach your goal weight. So why you may be able to get down to 135-140 lbs fairly quickly, getting down below 130 may take somewhat longer. (I don't mean to rain on your parade, just setting some realistic timeframes).
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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