I always have options--the issue isn't finding someone who wants to date me, it's finding someone I want to date. I'm just not interested in that many people anymore, and looking back, I've only been with one person who seemed even remotely compatible with me. I guess I've been around long enough that I've started to figure out what I need from a relationship, and why I want one in the first place, and knowing what I need makes it harder to find someone who fits what I'm looking for.
For instance, I don't want to go out with someone if I don't enjoy talking to them--and I have social anxiety and hate small talk, so I don't enjoy talking to most people. I need someone who shares at least a portion of my interests (let's say 1/3) which in itself can be difficult to find. I like cuddling and kissing so I need someone who's into that, but none of the people I'm interested in ever seem to enjoy physical intimacy outside of bed.
etc.
So, I have plenty of opportunities to be with someone, but I can't seem to find anyone I want to be with. The problem can go both ways.