Be it emotional or material support there is someone there.
There's not
always someone there for you. I had a good year+ when my son was very little, after I divorced his biofather and married Jabber, when it occurred to me that, if I dropped dead on Friday night, no one would miss me until I didn't show up for work on Monday morning. I had no one I socialized with; no one I even talked to on the phone. I had a toddler totally dependent on me, but no support for me.
But I'm speaking of being able to stand your own company; to be content when you are home alone; comfortable in your own skin. My son sees being alone in an apartment by himself as some sort of horror. He's said, when we'd try to tell him to get a one-bedroom or efficiency and NOT have a roommate, "...and I'll sit there all alone with no way to do anything or see anyone and just be suicidally depressed!" That's not a "healthy" attitude toward being alone. I've lived alone. I went to work and came home, did housework, watched TV, read a lot of books, went to bed, got up went to work and came home....rinse and repeat. But I wasn't suicidally depressed by having no social life. If I got too bored, I'd take a drive, stop for a beer, visit with strangers. I'd go to the library or go shopping. I had co-workers, but no close friends or family to visit or hang out with, but I was fine. I took vacations alone. I actually quite enjoyed it.
There's a saying that to love someone else, you have to love yourself first. I think that's true of friends. To have people like you and care about you, you have to like yourself first.