Good on you for resisting the emotional eating trap! Families can be really tough sometimes, can't they? I have two aunts, both in their 60s, and-to my eyes- they seem to have got along ok- the youngest one has stopped having anything to do with the older one about four years ago. When you talk to her about it, it's lots and lots of little things which relate to the older of the two always presenting herself as the more popular/successful/smarter one, and her presenting the younger sister as the maker of stupid mistakes. My mother, who has passed away, was the oldest of the the three, and all the time when I was growing up, I thought they were all close. Although I did always think that the younger one was ditzier, and to be truthful, I always thought she had a drinking problem, which she probably didn't. In short, these behaviours festered for so long that it became a disaster. Now the younger aunt has no contact with most of the family, because we are in contact with the older aunt, which is such a pity.
Darling, you know who you are, and are deciding who you will be in the future. Hopefully your dad was just grumpy today, or perhaps he really has got you wrong, in which case he is in for a nice surprise. Try not to take it personally, it happens in ALL families!