Need Help with my weight loss goals?

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So I'm 19 about 183cm tall and weigh about 115kg, I was recently told my weight loss goals were very hard to obtain so I want help in adjusting them. Here were my original goals, to get down to about 95kg by May and hopefully by September to get down to 80kg. If there are weight loss goals you recommend then please help me out, I want to lose it and keep it off.