Let's face it - we all have our demons. Not many people have had the perfect life and we all have our own personal issues to deal with. We're not saying you have to enter relationships with zero baggage, but dealing with that baggage in a mature way and showing emotional stability is very attractive to women. We already have our own problems to worry about, and dealing with someone else's stuff isn't our idea of a good situation.
A man who recognizes he has some problems to sort out and then takes control of it is a rare find, so you'll find women are very receptive if you're actively working on making yourself better. When two people come to a relationship as emotionally stable individuals, the chances of it succeeding are so much higher. Your partner should never have to be your therapist.