How do I get thinner?

You say you eat 'healthy.' Eating healthy doesn't just consist of eating veggies and fruits and drinking plenty of water. Maybe you should consider actually eating breakfast and lunch. By not eating either of those meals you slow down your metabolism which is what your body needs to help burn fat. You need to embrace yourself for who you are and not be so worried about how others are compared to you. We're all beautiful in our own ways. :D