When you live with anxiety, sometimes little aspects of friendship can be hard. But that doesn't mean people with anxiety can't maintain friendships. And it doesn't mean people with anxiety don't care about their friends.
Listen earnestly to anything your children want to tell you, no matter what. If you don't listen eagerly to the "little stuff" when they are little, they won't tell you the big stuff when they are big; because to them, all of it has always been big stuff.