How do you release your pent-up emotions from a life of constant struggle?

Hi I need some advice on ways to release and let go of built-up pain, rage, anger, whatever the emotions bottled up inside from a lifetime of ongoing hardships. How do you do it without hurting yourself and others? Listening and singing to heavy, dark music has always been my outlet but now it seems like it's not good enough anymore. Sometimes I do silly things just to let it out like screaming into a pillow or when I am driving alone in a car. But when things became too overwhelming, I ended up hurting myself which I know isn't the right way to cope. I've been struggling all my life and now at this age, things feel like they haven't gotten better but only worse, and I really need help. Thank you very much to those who reached out with help and advice.