400
(Speaking about his childhood)
Siempre me porté bien, no molesté a nadie, no lloré, obedecí a mis padres, y nunca mentí.
porté --> portaba, molesté --> molestaba, lloré --> lloraba, obedecí --> obedecía, mentí --> mentía
When speaking about your childhood, you talk about things you used to do. In this case you must use the imperfect form, rather than preterit.