What does it take/mean to be called, a "Friend"?

I feel like I'm slowly losing the ability to call a person a "friend."

A few weeks ago, I talked to a guy friend of mine online and apparently he said we've been friends since childhood. I asked him, "Am I a good friend?" He said, "Yes," but I feel very insecure of his answer. I came to conclusion that we've known each other only on a timeline of our lives and not personally. Am I a horrible person just thinking that?

I defined the word and this may be the knowledge of a "friend," but I don't feel emotionally attach to them:
1.
a person attached to another by feelings of affection or personal regard.
2.
a person who gives assistance; patron; supporter: friends of the Boston Symphony.
3.
a person who is on good terms with another; a person who is not hostile: Who goes there? Friend or foe?