My parents keep tempting me with food and making me feel guilty for not eating crap ?

my parents are both big and i love them to death but everytime i try to lose weight and stop eating bad they always make me feel guilty and my dad even asked me to go to sonic and i was like ill go but ill just get a unsweet tea and then he was like nvm i dont want to and i was like why do i have to get something for u to be happy and then he was like it makes him feel better when we both eat fast food together and it will make him feel less guilty. and today my dad is making terriaki wings (just for me) and i told him i dont want any but he still keeps on asking me and getting more food just for me like and my moms the exact same weigh butcept when i eat healthy she comes to me saying honey i worry u have a eating disorder (and trust me i dont) and if i dont eat humungous porportions she thinks im not eating, like what am i supose to do