I'm 19 years old, weigh 107 kg (235 pounds), 157cm tall (5'2). I need to lose 55 kg by 2019. I've tried the gym and eating well, but struggle. Advice?

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I weigh 98 kgs now. It's a slow process, but I hope I can reach my goal in time.
I'm 19 years old, weigh 107 kg (235 pounds), 157cm tall (5'2). I need to lose 55 kg by 2019. I've tried the gym and eating well, but struggle. Advice?
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