" Since only about 50 to 60 percent of the population enjoyed a secure attachment in childhood (a shocking statistic, really), those of you HSPs who tend to be very cautious about close relationships (avoidant), or very intense in them (anxious-ambivalent), can still consider yourselves quite normal. But your responses to relationships are powerful because there is so much unfinished business in that department. "

― Elaine N. Aron , The Highly Sensitive Person: How to Thrive When the World Overwhelms You