Why does everyone forget about me?

Literally everyone... My friends always say "we should hang out", but they never really care if we do. My friend suggested we hang out today but she never finalized the plans so that didn't work out. I even had a job interview today at 3:30, but the manager forgot about me and clocked out early. It's ridiculous. People I know and people I don't know just forget about me and it sucks.