Parents are trying to force me to stop being vegetarian

my parents don't respect my eating choices and they literally told me that their way of eating is the only way. i was pescatarian before but just decided to become fully vegetarian/ eat a lot more vegan. it's really stressful right now since i'm starting to apply to colleges and enter my senior year of high school, and vegetarianism/ veganism has been my escape and way of channeling my creativity for so long-it's like one of the few things that brings me happiness. but my parents (especially my mom) don't care, her argument is that im not eating "balanced" and I HAVE TO eat ANIMAL protein. this is ridiculous- this is obviously an opinion, and she says it like a fact. She wants to "cure me", and not a day goes by without her complaining about my eating. today she tried to force feed me fish , and set a timer and said that i had to eat it before the timer was done. i pretended to eat it but threw it away, but i dont know how i can keep escaping this if she tries it again though. I can't wait for school to start so that if she tries putting fish in my lunch I can just throw it out or give it to my friends if they want it (they always ask for my fish). And, theres absolutely no way I can just sit down with my parents and have a nice heart-to-heart chat, so I don't know how to get them to shut up and let me do things that make me happy. Its a win-win situation where eating vegetarian makes me feel happy while also not hurting many animals. whenever i ate meat I just felt endless self hatred and guilt