What should I do about this?

저기요 snap I'm a vegetarian too ^-^
I decided to become vegetarian at around 9 years old. Luckily my parents were fine with it amd respected my opinions, and gave me meat substitutes instead, like quorn, nuts, vegetarian sausages, burgers, chicken etc..

As for your situation, its quite difficult because 당신 say 당신 can't get your own food. I totally understand that your dad isn't being helpful, so you'll have to sit down with him and the rest of the family where possible and talk it over, because he probably thinks its just a phase.
Try not to be too rebellious and don't say 'refuse' and 'you cant force me' and so on, be really calm and super nice and explain that either way 당신 are not going to eat meat, because 당신 don't like it and 당신 would feel much better and 더 많이 relieved if they could respect that.
don't forget to big it up and say how stressed it is making you, and 당신 could even throw in the fact that 당신 had to ask for help on the internet, this will really hit 집 with your parents and hopefully persuade them that 당신 are serious that 당신 don't want to eat meat, and 당신 need their help to get the right nutritions.

당신 will probably have to compromise, like maybe eating 물고기 또는 saying 'maybe on 일 i will consider eating meat again' even if 당신 have no intention of that. either way, 당신 will have to think carefully about this whole thing. 당신 could talk to a trusted teacher about it at school, 또는 go onto the internet and research help for beginner vegetarians.

Hope 당신 do ok hun, keep me 게시됨 how 당신 get on and let me know if 당신 need any 더 많이 조언 ^-^ x
Lottey x

Just don't eat the meat. *sigh* sorry I'm not helpful, but I'm not a 팬 of vegetarians, especially the ones who don't eat meat because 동물 are harmed, and no I'm not some cruel heartless person, it's just PETA people never even bother to actually know what's going on, for instance if deer aren't hunted they overpopulate and die of diseases and starvation, who wants to let some poor animal starve to death because there's too much competition for food?

Well, see if 당신 can have a formal talk with him, tell him why 당신 don't want meat and ask nicely for him to get 당신 음식 without meat.
My parents have always been supportive so this is only sort of a guess.