Should I seek mental attention?

My parents don't think I am serious about them bringing me to a therapist, a psychologist, or psychiatrist. I'm a minor, to be more exact 16 yrs old in my junior high (11th grade). I assume have a symptom of depression but I don't do anything physically - suicidal. I often mentally think about killing myself or like wanting to be kill. I used to have many negatives thought but I'm trying to be positive to get me through. There would be trigger moments and get emotional and angry. I may have anger issue nearly hurt someone or two smaller than me when I was younger. I felt foolishling guilty of harming someone. I forget if I did or say something, and not good at memorizing like everyone's name. I'm indecisive at most times. This is just something, I want to say. Please comment below for your opinions/advice/tips/ect, if I need or don't need professional help. it will help alot

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