First of all, you are only 15 years old, so you should focus on your study, and you shouldn't spend your energy on it. Moreover, slimming clothes have no effect, just bind you and make you uncomfortable.

I suggest you drink some tea, which can help detoxify and of course help you lose weight.

Tea like this, without tannic acid, does not affect the absorption of protein, so it does not affect the development. Children can drink!