I can count on one hand how many best friends I have. You can't be a "best friend" to everyone. You don't have the unlimited strength and resources for that. But God has unlimited resources. When you start trying to be everyone's best friend you start trying to please everyone and you'll stretch yourself too thin. You can't be pleasing everyone in your sphere of influence and be pleasing God at the same time. Not everyone is walking in God's will. So choose carefully who you befriend. See who has your best interests at heart and who does not. Also strive to maintain good, strong friendships with those who are your friends by being a good, strong friend yourself.
I just want to encourage and inspire as many people as I can for Jesus Christ.