Growing up with your best friend

Growing up can become hard, you may or may not have had the chance to become best friends with one of your close siblings. But becoming older, and with time, one of you might have gotten a chance to move away. Its just hard for me because I have always been absolute best friends with my younger sister, and she moved to Seattle over a year ago so now we are about 3 hours apart. Even though we both try to see each other more it still only works out to seeing each other about 4 times a year.. Think about it at one point your inseparable and now we only see each other for 2 days every 3 or 4 months! That's just crazy to me, and I am always thinking about how many other people are also going through this.