How can i boost my self confidence?

I have really low self esteem. I always think i look good and pretty at home but then i get to school and think i look like crap compaired to other girls. Guys out of school always flirt with me but guys in school give me nothing. How can i boost my conifence and why does people outside of school think im beautiful but boys my age in school dont even look at me. I always feel fat even though other people say im not and i cotinually have the urge to throw up after i eat. I hatw it please help:(
 
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