Your friends may not always be the grounded, down-to-earth types you seek, but they're entertaining nonetheless. And they sure need you (especially your moody Pisces and hot-tempered Scorpio pals)!
Many of them may look to you for practical advice on their own issues, or require your methodical ways to help them weigh personal decisions. While you're a great manager of people, you don't need to give in to all their demands. Sometimes, you just want some time to yourself.
Use that famous power of discrimination to keep out people who never give back in your life. Save your mad practicality for the ones who truly love you for all you do. You should accept only the best!