How do i go from being hourglass shaped to a ruler shape

people are built differently.. the sooner you accept that the better off you'll be.. the only thing you can do is work hard to look your best.. don't starve yourself or anything coz that doesn't solve anything and instead of looking healthy you'll look sickly.. if you want to look good then limit your portions of food intake and exercise regularly with cardiovascular activities such as running or kickboxing.. but remember that everybody has different tastes.. many guys like curved bodies.. back in the old ages a curvy body entailed balanced health that attracted men for the purpose of species survival.