It's not about your past, it's how you react to whatever life has thrown to you. How others treat you is their Karma, how you treat them is yours. People who are weak are like marshmallows, they get squashed easily when put under tough circumstances. People who are strong are like stone, no matter how hard you try to crush them you can't.
Be like the toy that never falls and always bounces back up, the harder you fall the stronger you get back up.