I don't really know exactly how to describe what you mean to me, but "family" comes close.

I think that's why it's so incredibly frustrating a lot of the time: I want to be there for you, to help you, to do something to make your life better and brighter, but it always seems I don't have anything to offer. You don't need someone to vent to, and if you did, you've got better people for it. You don't have problems I can solve, or even help with. So all I can do is flail around and try my best even though I'm sure that, at best, I'm just a distraction.