Always accept the possibility of catastrophic failure, that way you won't be surprised if it occurs. The myth that "there's someone for everyone" often leads to thoughts of entitlement - not everyone winds up in a relationship. Not everyone should be in a relationship. If you believe that there's someone for everyone, and that everyone deserves a happy relationship, then that by logic must also apply to serial killers and cannibals and Methodists. Not to put too fine a point on it, but bullshit. If you want it, then try for it. If you don't think you're capable of it, then try anyway. Don't fear the pain of failure, it's the only thing we truly learn from.