What's the True Meaning??

This is something I've always wondered. What is the true meaning of friendship? I mean yes I've had friends all my life. I have people I consider friends that have been around seems like forever. But I don't have one person that I call a friend who seems to value the friendship as much as I do. They've either lied, kept vital information from me, or just caused some sort of major drama in my life. And its not that I need them in my life but its all I know. Now its starting to affect me that I've walked around this earth for 21yrs and I don't know the real meaning of friendship. And again, it sucks to be me ...