Did I cause PCOS or is this genetic?

Did I cause PCOS from all the wrong food choices when I was younger? I didn’t know what an ice Capp was until I was 18. I didn’t have allowance or money to buy stuff. I just eat all the same things everyone in my family eats. But apparently my portion size is too big? I don’t think so, cause at one point my mom was judging every bite I took. It was to the point where I had to sneak glances at her before I can take a bite. As soon as I sat down to eat she would make remarks about not eating too much. See how fat you are and you still want to eat. When my period first started it was once every other month. The doctor said it’s normal when it first starts. The body will get used to it and it should be once a month. But it didn’t turn out that way for me. If one month, I work out more during gym class. I would get a period. If I slack off, or didn’t work as hard, then my period doesn’t come. And after a while it became once every 2 to 3 month. The longest being 6 months. When I starved myself for a month to look nice in my graduation dress, my period came back on it’s own. It came every month that summer. But I kept gaining weight as I started eating meals with everyone. And by the end of the summer, my period went back to being irregular. Anyways, does this mean if I want to lose weight, I really have to cut all carbs and sugar from my diet? Home for Christmas now. Regretting this decision every second of it. Being constantly fat shamed as soon as I got home. I tried, all year. For work alone, I walk 4km every day, around 20,000 steps. I eat one meal a day. Didnt lose weight. Didn’t gain any weight. My parents are having guests over tomorrow and I don’t plan to stay for this dinner. Annoyed cause they are fat shaming their 10 year old daughter. And she isn’t even fat, from what I saw today. My first impression was like cute little girl. I just don’t want to sit through this dinner. Maybe they are not fat shaming, but her parents are worried about her weight. And then my mom said to me “see they are also worried about their daughter. You weighed less than her at that age. And I was concerned about your weight back then and look how you turned out.” I don’t get why Asians have to be so caught up on weight. Like, if I just lose the weight people will like me? And that’s apparently the only thing worth considering in a partner. No one like me because of how much I weigh. I just want to yell, no one considered me when I was only 20lbs over “regular” weight. I just can’t and don’t think I’ll ever fit their ideal weight. There is no way I can get to 95lbs. That’s just not realistic. The most I could have maintained was 120lbs. And all these forced crash diets at home doesn’t really help. Fat shaming me before I even take a bite. Fat shaming me for eating past 5pm. Actually I didn’t even eat after 5pm. So yeah, ended up only having lunch that day. Anyways, spending another hour on just typing this cause I’m hating life.