I'm 13 & a half. i weigh 135 pounds. i need to lose 20 pounds before school starts again. HELP ?

i always have a crave to eat every 30 minutes. some days i do, some days i don't. i weigh probably 135 &i wanna lose all the excess fat in my body; the love-handles, baby fat left in my arms, that bit of fat in between my thighs, have a thinner waist, & tighten my butt. any HELPFUL advice, please ?
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