I noticed that you are a college freshman. Colleges and universities offer mental health services to their students. Their services are free of charge to enrolled students, confidential and are often the best available in a community. Because your parents seem unwilling to support your seeking mental health services, the college counseling center may be your best option. My recommendation would be make an appointment and discuss your anger problems with mental health professionals.
I would also encourage you to have a medical evaluation. I don’t have all of the details about your anger outbursts but it seems as though you have little or no control over these incidents. You stabbed someone but have no recollection of having done so. It is possible that there is a medical explanation for what is happening and therefore it’s advisable to be evaluated. Discuss your symptoms with your primary care physician or the therapist upon your first visit to the college counseling center.
In the meantime, it might be helpful if you began to document the instances in which you become uncontrollably angry. Doing so may uncover a pattern. For example, you may find that you are more prone to anger outbursts when you are tired or when your stress levels are high. In order for the problem to be remedied, it’s important to identify what triggers your anger.
You should also educate yourself about the nature of anger. Consider reading anger management workbooks or books that directly address and explain anger. A popular choice on Amazon is the book Beyond Anger: A Guide For Men: How To Free Yourself From The Grip of Anger and Get More Out Of Life by Thomas Harbin. Please take care.