Hey darling,
I tell you what parents are a BATTLE and it's bloody tough fighting them on the vego topic, especially if you are living with them coming home to them everyday, a lot of people don't realise how tough it can be.
Firstly, your heart is in the right place, in no way should you be feeling guilty!
Secondly, the reason your parents are fighting you is usually because they are concerned for your health and wellbeing, not because they are mean!
Thirdly, I recommend doing some research besides the animal rights argument, health works on parents. A delicate balance is an amazing easy to understand documentary on the health benefits of ditching meat, going into detail about how it's one of the biggest causes of cancer next to dairy!
Purchase the doco, watch it, explain to your parents, then get them to watch it if possible. If you are serious enough a really good idea is to offer to cook your own meals, see a nutritionist before you broach the topic so you can write down all the deets about living a healthy meat free diet, sit them down explain and most of all,
don't raise your voice, even if they yell, not raising your voice shows maturity and dedication.
don't expect them to change their minds immediately, take your time on the topic!
don't nag! Parents hate nothing more than constant badgering and will just encourage them to stand their ground on the subject.
If you need any more advice or have any more questions I'm here for ya, I may not be on the forums much any more but just shoot me a message and I promise I will get back to you ASAP
You don't need luck, just solid feet and the assurance that people like myself now vegan and a kickass volunteer for organisations such as animals australia animal liberation and sea shepherd have been in the exact same position as you, four years ago now to be exact, I was pescetarian (no meat besides fish) before my parents finally caved! Didn't go vegan til I moved this year!
Love and peace to you little one