Little sister got engaged

I just need to vent. So my little sister got engaged 4 months after me. I am so happy for her. She is planning to have her wedding in 2021 while mine is booked and set for 2022. My mom thinks she is crazy for trying to plan a wedding in less than a year. It kind of is bothering me that she is planning her wedding before mine since her fiancé has always said that they were going to get married before me while they were dating. Just makes me feel like she is rushing to get married and before me. I’ve asked her what the rush was for and she said there was no rush but is trying to plan everything in less than a year. I just really needed to vent this to people who isn’t my maid of honor and fiancé. They heard enough of me lol