No one ever keeps plans

Apparently the world thinks its ok to cancel on my repeatedly. That's ok I needed another reason to hate myself and everyone around me. In the last week I have been canceled on 5 times by 2 different people. Both of which made the plans with me each time and canceled with less than an hour of said meeting time. One night he was supposed to pick me up from work. Didn't show and u had to wait an hour for my sister to come get me. Why do people think its ok to cancel on me and at the last minute too? How am I that unimportant to everyone I come in contact with? What the hell is wrong with me?