How can I stop my sweet tooth?

I have horrible eating habits. And I'm really not proud of them. I eat barely any vegetables and hardly any protein either. But my main problem is I'm a really picky eater. Except for sweets. I have a HUGE sweet tooth. Nutella and Oreos are heaven, but I'm afraid that I'm going to become obese (I weigh like 128 at 5'2" rn is that bad?) is there any tips you can give me so I can cut back on the sugar and start eating healthier? (Without completely cutting it out though please)
How can I stop my sweet tooth?
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