I'm afraid that all of my friends are going to go off and get married and I'm going to be the only one that is not married.
And this scares me not because I'm afraid of being single, I don't care much about that.
The real reason is because I'm afraid that they are not going to have the time to really be a close friend. That they are going to be spending so much time/energy on work/school/sig other that I'm going to fall down in the priorities.
Yes, I'm being selfish, narcissistic, and overtly sensitive about this. But why not. If it helps me get it off my chest and out of my system, that's a good thing.