By skyforbes 
This week, I made this drawing of Aang, from ATLA and it's the first time I've actually done something I am really proud of. I know that for some experienced artists this is nothing, but to me it meant everything. It might not be the best "fanart" in the world, but when I finished it I felt proud. I felt happy. I wanna get better at painting and doing sketches, but this felt pretty good to me and I showed it off to everyone in my house because I felt so good about my drawing.
I left the sketch with a couple others I'd been working on at the coffee table in the living room, since I was looking for a frame to put it on, because I wanted to hold on to it as the first I had ever made. I had to put a hold on looking for a frame since my cousin (15F) came to spend the weekend at my home. She is an artist and was also proud of my sketch, which made me like it even more.
About an hour ago, my cousin was leaving and I came to collect my drawing since my aunt brought me a frame to put it on as an early christmas present by my cousin, but when I looked at it, I saw someone had doodled over it. I immediately burst into tears and I felt my heart shatter. When I came into the kitchen and showed it to my family, my father admitted that it was him who had done that with a blue pen, joking that "dude needed some lashes". I broke down crying again and told him he ruined my drawing. He said he didn't, and was just testing out the pen and decided to contribute to it somehow. My mother got pissed at me for making a scene in front of my cousin and aunt and my father kept telling me to grow up and stop crying for such a stupid reason since I could just make another drawing.
I tried explaining to him the sentimental value this sketch had, and how making another one won't fix the issue, and that he knew how much that drawing meant to me. I also told him that he would have been really pissed if I doodled over his work spreadsheets, but he said it's not a fair comparison.
Both my mom and my dad are pissed at me for being upset about the drawing. They think I am overreacting, but to me it's not about just the drawing, it's about dismissing my feelings and the effort I put into this work. My father refuses to apologize and my mom thinks I embarrassed my father in front of his sister.
So, reddit, am I overreacting?
(ps: sorry for any grammar mistakes, english is not my first language)