<human>: I haven't lurked this sub for long, so sorry if I violate any sub rules. 

 Ever since I was a little one, I have been overweight. I attribute that to the fact that I ate the portions of an adult male and watched Power Rangers all day. I was my heaviest at age 11. At 5'2", I was about 150 lbs, maybe even closer to 160 as I never weighed myself. In the winter of 2012, I started running and, gradually, eating less. My weight dropped to 130 nearly overnight. Today I am still at the 130 lbs mark, and while I'm pretty happy where I am, I'd like to drop to and maintain 120 lbs. I don't strictly count calories, but I'm very aware of everything that goes into my mouth. As for exercise, during school I'm not as active as I'd like to be, with the exception of Ultimate Frisbee and home workouts. One issue is that I have difficulty finding weight loss advice that works with a high school schedule and resources. An example of this is that I cannot make lunch for myself in the morning, so I have to eat the greasy non-filling pizza the school provides.

From reading up on weight loss, a lot of time I see that you should never consume below 1200. Is eating less than 1200 really that harmful? I've also heard that to overcome a plateau, [some will recommend that you increase your calorie intake to about 1800-2400] which seems to go against the idea that it is simply burning more than you consume that leads to weight loss. Can someone please clarify this for me?

If there's not enough information (e.g. my diet specifics or exercise routine), I'd be happy to add some on. I don't want to overload y'all with too much.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: 16, 5'2", 130 lbs and have been trying to lose the last 10 for two years. What changes should I make to my routine? Thank you for your help :D