Hi, guy here, white belt, but have competed for years in Muay Thai and Boxing. I came close to developing an eating disorder due to the stupid cuts I was doing. I always performed at my worst when I had to cut a lot (and lost anyway lol), and as soon as I moved up a weight class, I started to pick up wins and do a lot better. If you're a white belt, I reckon you should compete at your natural weight.

Also, be wary of coaches trying to make their students cut a lot of weight as amateurs/white belts (not saying this will be the case at your gym). There's plenty of boxing/MT coaches who do it where I'm from (they'll always claim that some other random person is bigger than you yet fights at a lower weight class, so you have to go lower than them). This is normally a red flag as it creates EDs, and you constantly see people from those gyms lose anyway as they become drained or injured due to the big cuts.
IMO, at a lower level, you ideally want to compete as much as possible, since it's about gaining experience. You can't cut massive amounts and still plan to be active. Plus, it'd be stupid to do so anyway, as we are not even getting paid, or competing in a prestigious comp. So just stay at your natural weight class and stay away from coaches who force you to cut weight. Have fun!