I think i might be a loser, how come no one responds to me on facebook?

I know this might sound pathetic but it almost seems like no one really responds to any of my wall posts...while some of the other peoples posts say seem to be uninteresting at times, yet no one seems to pay attention to me. Do you think its possible that some of the people I know may not care about me at all? I'm 27 and I have a hard time getting true friends let alone a gf. I just dont get out of the house much of a problem.