Am I trying to lose TOO much?

I''m 15 years old, 5 feet and four inches. I weigh about 186.5, and my bmi is at about a 32 (which is at obesity level) and my goal is to be about 110 lbs. which is at a 18.9 bmi.

I wanna try to achieve this by August. Am I trying to lose too much? Is it unhealthy?

Plus, what are some good ways to lose weight?

Here''s a picture of me from about a year ago, I haven''t lost or gained any weight since then.

http://24.media.tumblr.com/2c1f416349978a17da2b8831eff2bc93/tumblr_mhizjnHLN61r4yza2o1_400.jpg

How to Lose Weight Naturally - You''ll Wonder Why You Didn''t Lose Before

Recommended Answer:
BMI is a horrible way to measure fatness, It is scientifically nonsensical.
It''s really better by far to go by "body fat %" (the Ideal BF% being about 20% for a woman)

although it might be difficult to achieve, it is a fairly safe time frame for that amount of weight(losing at a rate of 2.5 - 3lbs a week)

as far as how to lose fat the first thing you''ll need to do is learn to count calories and clean up your diet so here''s a good resource for that: http://www.freedieting.com/tools/calorie_calculator.htm

Other than that I''d also recommend a basic exercise plan

http://www.beachbody.com/product/fitness_programs/power90.do

or

http://www.beachbody.com/product/fitness_programs/power_90_master_series.do