I had big ears all through school and used to tie my hair over them so only the lobes would show, but my head got bigger and by the time I got to 18/19 they seemed to have shrunk (or my head caught up with them, I don't know which). I would give it a few years as they may have had a growth spurt early (sounds weird, but body parts do that sometimes). In the meantime, start saving up the money for surgery later in case you still want it and if you no longer need it by that point, you will have a ton of money to spend on something else. By that point your parents won't have any say over it anyway!
School is crap for everyone anyway - if you don't have big ear, you have acne, if you don't have acne you have braces, if you don't have braces you have glasses, if you don't have glasses you're overweight. Is a generally rubbish time for anyone to go through! I look back now and I'm glad I don't have to go through it ever again - but at least we were all spotty, greasy, hormonal, insecure mutants together and you know at least you will grow out of it or have money to change it later on!