<human>: My sister, who is 8 years older than me, is kind of giving me a headache right now. She's always been much more social and shit than me. I can be outgoing, witty and confident at times, sure, but I'm also a teenager, insecure, etc. she's always had a large social circle and my family have always loved her, but I barely leave my house anymore (a completely different story, my parents are overprotective due to my sisters antics during her youth), and am a bit more reserved around family now. 

Yesterday, she came round to my house for her birthday, and I said happy birthday and have her presents and shit. My grandparents came round too, and I had my earphones in. When everyone was leaving, I heard my sister complaining to my mum and grandparents about how 'anti-social and weird' I've become. I didn't say anything, didn't want to cause a fuss, but it felt like shit. All I said was 'I'm not deaf you know', but they all pretended not to hear me.

Today, it's her birthday, and while everyone's been sending her Facebook posts saying happy birthday, I didn't since I said it to her face yesterday. My mum told me to send her a message, since she asked her why I hadn't, and told my mum there's no point since I said it yesterday, I don't have to broadcast to the world that I said happy birthday to my sister just for it to be authentic. Sure, I'm being a bit stubborn, but my sister's being fucking stupid and shallow.

Basically, I want to affirm if I'm in the right here or not, and how I should deal with my sister being like this.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: sister claims I'm anti-social, being petty over lack of Facebook birthday message. How can I deal with her?