In this study, it was aimed to determine the variables affecting self-efficacy and cyber bullying. The participants of the study were 223 high school students. The data was collected through the use of self-administered questionnaires which were the General Self-efficacy Scale, the Gratitude Scale, the Early Memories of Warmth and Safeness Scale and the Revised Cyber Bullying Inventory. Results of structural equation modeling analysis revealed that self-efficacy was affected by early memories of warmth and safeness and cyber bullying was affected by being a cyber victim. All goodness of fit indices of the model in this study was satisfactory. The results of the study demonstrated the importance of early memories of warmth in improving self-efficacy and preventing cyber victimization is effective in decreasing cyber bullying.