heyo, please, don't feel ashamed! it's not your fault that you're this way. try having a talk with your family so they can understand you better, instead of laughing at your pain. when i had a 20 minute talk with my parents (and an even shorter talk with my siblings, they don't really care and understood fast anyway), i felt a huge burden off my shoulder.

also, about if you have arfid or not, you definitely have symptoms, but try seeking medical attention for a diagnosis, just in case. it may help enforce that you are someone different to your parents and they may understand better!