They also can gain maturity and strength of character as a survival skill. Some enter professional caretaking careers. Using the strengths gained through years of unhappiness can be very powerful. What we learn from abuse is that we can survive anything. Learning to overcome the problems caused by abuse through education and therapy can help a person become more mature and compassionate toward others.
Balance is the key.
One can learn to balance gentleness and assertiveness, trust and carefulness, self-esteem and respect for others, anger and quiet. The glass is not just half full or half empty, it is both. Learn to look at the other side of everything you do. Look at every problem as potential to find a strength. Here's an exercise to try.