Does anyone else eat less than they should in calories and have complicated medications? Can you give me advice?

Hello! I am a 19-year-old transgender man who takes testosterone, and I am Obese. I have noticed that my calorie intake is under what it should be for someone who has been on testosterone for more than four years now. Honestly it's low for anyone, whether their a man or a woman. Clearly, I won't just lose weight from lowering my calories, so now I feel like my whole mind has kinda been blown! I was always told growing up that you have to cut calories to lose weight, but it seems like the less I eat (I will skip things like breakfast and lunch), the more I am hurting myself. To note some things: I have ADHD so I struggle with eating since there are no cravings or even a feeling that I'm hungry. I'm also on two antidepressants, and those might be raising my insulin.

For those of you out there who had to eat more to lose weight, how did you do it? Did you add more protein? Did you cut down on carbs? I am more than willing to force myself to eat (as long as I have plenty of timers to remind me) but oftentimes I get sick even after having a snack because my stomach is rejecting the food. I need to get over that hill, but when I do, what food should I stuff in my mouth?

I really want to lose weight for top surgery, and I don't want to have a complicated surgery. I've started walking a lot more (I've reached 5000 steps a day!) but it's been a month and I have definitely realized a big flaw in my eating. Only 1600 calories is not enough I guess. I think I've been screwing myself over for a long time because of that!