I can totally relate. I have some friends from CR who are AMAZING friends and have saved me from myself, literally. I have some others who are gossipy and just not who I want in my life as my "friends."
My daughter had a cheer comp yesterday and the moms that are good friends all sit together. Yesterday my husband went w/me, he said it was like being around a different person b/c I was so happy and having such a great time and laughing so much. He said I should hang out with those friends more, and I agree. They are super great and we have a blast together. I could also tell them anything and they would be right there for me. I guess I have not thought about it that much until yesterday, but it is true that good friends can make such a positive influence in your life.