My sister and I took an early 7 a.m. flight to New York for her birthday. The night before, I had put on a new Dexcom, but just as I was leaving for the airport, I got a notification telling me to remove it immediately because it was defective. Cue me frantically trying to replace it without crying—definitely not the smooth start I’d pictured. At the airport, I somehow ended up at the wrong gate while my sister was at the correct one. I went through security alone and made it to what I thought was our gate, waiting by myself for about 20 minutes… until my sister called, annoyed, asking where I was. She thought I was running late and was now rushing through security, while I was already calmly sitting at the actual gate, ready to board. We finally met up, I apologized for the mix-up, she forgave me, and we grabbed some coffee. Caffeine in hand, we headed back to board—only to discover we were surrounded by a group of about 20 teenagers on a school trip to New York. My sister and I aren’...