How can one heal from the effects of psychological traumas?

I grew up in a society that is very abusive to children and as a result I developed psychological problems and stuttering early in life which resulted to more traumas and it got severe. I was kind of damaged psychologically to the extent where some certain setting/event made me collapse(usually setting of me and an elderly person. Like trying to talk to a teacher that is being rude and talking down at me, trying to explain myself to an elderly person when in trouble etc) and more others. I am 21 now(male) in university, I have learnt a great deal of myself and psychology and even processed all my traumas. I am no more stuttering except with my family. But I still suffer from the effects of my traumas; it has made me a very psychologically fragile person... For the past 1 and half year now I have been learning more and more about psychology and emotional education(and sorts) and it has made me become very sensitive to my traumas and has kindof triggered the severity my traumas had on me in my younger days. I completely loose myself sometimes when talking to a person in authority or in some certain settings, a terrible stuttering jumps up. I have done rigorous self-analysis and processing on my self in relation to my childhood traumas and I understand why I do it, but still I am making no progress stopping it, seems like it's completely beyond my control and comprehension. It's getting worse I am literally loosing it for good. Please I need help on what to do to start healing?