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Weight... Please help...

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So im 15 and I went to the doctor and I found out that that my stomach has been pushed in.. Like he told me its been like that for years.. He told me that most likly when I was younger I sucked in my stomach like 24/7 and it got almost stuck... Like... It hurts to put it to normal..like ... Ok its hard to explain... But neways... He told me I have to lose weight as fast as I can so my stomach will be flat and then everything will be normal... But he didnt tell me how to lose the weight... So thats where I need help... I need to loseat least 20pounds fast or this could really hurt me... So please help?!