How do I get rid of all my pent up anger?

People don’t even listen to me and neither do I. I’ve been talked over all my life and kept everything to myself that I don’t even know what to do with my feelings. Anger is inside of me, it’s like it’s waiting to be unleashed however I feel it for a split second and then it’s gone it’s still there but I don’t know how to get it out of me. It’s suffocating I don’t know what to do with it. It’s also my thoughts I don’t know what I want, I’m just blank and empty. How do I deal with this? How can I make it all stop?