How Do You Know If You're Waiting for Love or Hiding Behind Your Standards?

I've never been in a serious relationship because I always find something wrong with the people who approach me. One is not ambitious enough. Another isn't spiritually mature. Another doesn't communicate well. Another doesn't have the kind of future I envision. Recently, I started wondering whether I'm genuinely discerning or whether I'm using these standards to avoid the vulnerability that comes with being in a relationship. How do I know the difference?"