How old are you? What is your family situation like? You know you're not that powerful to be the sole reason for anything. What is it you're going through right now that brought on this kind of thinking? Have you sought any professional help or seen a counselor?
Your thoughts are both very common and also very untrue. You are not the sole cause for family trouble. If you need help, call the Lifeline 1-800-273-8255 or text "Montana" to 741741. Visit https://suicidepreventionlifeline.org/.