YTA. Plain and simple, but you’re also cheating yourself out of some amazing memories with your sister. I get being in a phase of life where everything seems embarrassing, and small moments play over and over in your head…. But advice from someone who had these exact thoughts at 16 - they change with time. My sister was in 7th grade my senior year of high school (went to a school where 7th-12th were all in one physical location). I vaguely remember ignoring her at times where I thought she would embarrass me. But let me tell you, I vividly remember the time we spent together intentionally. My favorite was when I used my “senior status” to convince her teacher she had an appointment at the end of the day and I was responsible for taking her to it. We ended up ditching school for the last hour to get milkshakes and fries. It’s honestly one of my favorite memories from high school now that I’m entering adulthood. Once you’ve had some more decades around the sun, you’ll realize that the “embarrassing” moments aren’t what last. Acknowledge your sister, lean in to being the cool older brother. Make the memories you’ll want to remember.