Turns out I was totally wrong (surprise, surprise). Having my sister on the team was the best part of my last two years of track.
Now, when I look back on those years, I don't remember how many friends I made, how fast I ran, or if I felt independent. Instead I remember getting Noodles and Company after practice, driving home late at night after meets, singing in the car on the way to practice, and cheering for each other during races.
So here is my advice to you: Make time for your family. They may seem like a pain and all you can think of is how much you want to get away from them, but you need them. I'm four hours away from my siblings, and I miss them like crazy! I want nothing more than to drive around with the windows down singing with my sisters.
Take the time to do things together -- big and small. Spend every moment you can making memories with your family. They are going to stick around longer than any friend, and relationships with them are unbeatable.
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