how to get protein and nutrients and stuff even if im a vegeterian?

im a vegatarian because i love animals of all shapes and sizes…and ive been on peta.org and been disgusted of what ive seen. ive been a vegtarian for a month know my mom says im going to stop growing and not get enough proteins or nutrients . i want to grow really tall (iwant to be a model when i row up) im already 5′6 and im 12 almost 13 but i want to know how to become a vegetarian who you know gets there nutrients n stuff
thanks all of you guys!! my dad to me to a vegetarian restura to see what nutrients im supposed to be eating it was so good the tofu was delicious and the rice and this delicious soup!! and vegeterians can eat more without gaining weight and there was even this chocolate cake that was really good without any milk in it…and i figured out that our digestive systems ARENT even made for meat