What can I do to lose at least 20 pound in 2 months?

I'm 17 years old, (female) 4'10" and weigh 125lbs. I do very little exercise, but I don't drink any soda, mostly water with lemon in it. I really want to lose weight in the next two months because my mom is wanting me to go on birth control and I've heard it makes you gain weight, and... show more I'm 17 years old, (female) 4'10" and weigh 125lbs. I do very little exercise, but I don't drink any soda, mostly water with lemon in it. I really want to lose weight in the next two months because my mom is wanting me to go on birth control and I've heard it makes you gain weight, and I've already been wanting to lose a little weight but now I really want to lol. Any tips for a healthy weightloss? I can't really go running or walking in my neighborhood, not very safe where I live, but I do have a stationary bike. Help?!?!? I'd really like to focus on losing weight from my waist down.
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