It's almost instant rapport when you meet someone and find out they've been to your home town. Even better if they know the name of the hamlet or town instead of the closest city.
It's the same when you share experiences. A shared experience is a powerful tool in building rapport.
However, mistakes, failures and problems in life are not fun experiences to share. It's uncomfortable and requires more courage than many are willing to muster. Much easier to keep those hidden.
But when others know you've experienced a similar problem, you're that much closer to establishing rapport and opening the door to using your mistakes to improve the lives of others.
Be courageous today and, to the degree it is valuable for others, share your mistakes.