Am I wrong for being mad at my sister because of how she acted during my senior prom
I'm a senior (18) and my sister is a sophomore (16) and I thought it would be fun to take her to my senior prom. She had missed homecoming that year because she had gotten death threats based on something she said at school so she wasn't able to go. I thought it would be fun for us to go together as sisters as my last prom before I left to California with my aunt. Boy was I wrong.
I had started telling her that I wanted to take her in DECEMBER (Keep this in mind) and I officially told her that I really wanted her to go in March. Prom is in May so I thought that would give her a lot of time to prepare if she wanted to do anything with her senior friends. My friend group asked me beforehand if I would go to dinner with them and take pictures with them. I agreed as long as my sister could join on for pictures. They all agreed because they were excited to meet her. In the time between March and May I got my dress, shoes, bouquet and jewelry. I offered multiple times to take her to get hers and she declined and even yelled at me because she was busy.
Finally, the week of prom she started bragging to her friends that she was going to prom and asked if they had any plans. They had ALL made reservations at restaurants and they couldn't change it, and they all had plans to get ready together. Thats kinda when she started acting mean to me. She would berate me about not having a dress, shoes or a bouquet, yelled at me to get the guest form signed (I asked her to take it to the office because I had finals that day and I wanted to take the morning to study and she called me fat for not walking there). When we did get the form signed she started yelling at me to take her to a dress store then complained when I didn't take her to the one that he friends were going to. When we got her dress she said hers made her look really skinny and I should've gotten a dress that would've done that to me. Finally the day of prom we had to leave early to take pictures but we had to pick a different spot because a memorial was happening at our original spot. She got really mad and yelled at me because I didn't pick a spot with a white background. My friends picked a spot with a bridge and some water overlooking it because we thought it looked gorgeous but she hated it. When we left to get pictures taken she forgot her ticked so she started yelling at our mom to turn back but I told her not to because my sister had already made us late.
In the end of pictures my sister took three pictures with me and said that she looked weird in this background but she guessed it would be alright. Keep in mind this is her SOPHOMORE YEAR PROM and it's my SENIOR YEAR PROM. Then when it was time for my friends and I to go to dinner she asked which car she was riding in and I asked her what she was talking about. She said that her friends made reservations so she was riding with me to go to dinner with me and my friends. I had NEVER told her she was going to dinner with us. My mom and her started arguing and they decided on my mom and sister going to dinner together and me going with my friends. So we ate dinner and we all went to the prom place. I rode in my friends car and met my sister there. When she got there she asked my friend if she could store her clothes in her car which my friend had no problem with at all. Then we all went into the venue. My other friend (the person whose car I didn't ride in) tried to make conversation at the table and asked how everyone's prom was going and I kid you not my sister said;
"Good I wish Pam didn't fucking ruin it with the pictures"
And I looked at her and started yelling before I could stop. I yelled at her and said that she was being a spoiled jealous brat who was ruining my senior prom and embarrassing me in front of my friends for being so rude. Then I stomped away and didn't see her for the rest of the night. I found out later that she sat at the table until her friends showed up, danced for twenty minutes then left to go to an after party. My friend apologized for starting stuff and I said don't worry about it.
The day after prom my sister was so fucking mean I wanted to die. She hit me in the face because I was taunting her lightly about her not getting a drink from sonic (I literally just said "no drink for gabby"). She called me fat when I showed the pictures in my dress and she said that it looked like a blind idiot did my hair (keep in mind she usually does my hair).
I don't know if this is just dumb sister stuff or if I shouldn't have yelled at her. I feel like I overreacted with screaming at her and I feel really bad for leaving her alone. I'm going to try to have a mature conversation tomorrow with her and apologize