Does the bullying have a long term psychological effect?

I got a little bit upset the other day at work after I couldn't do what a customer wanted me to and they were rather harsh towards me. She was a little patronizing. Luckily my manager came to handle the situation and after, he took me aside, I ended up crying and thought he would have a go at me but instead, he told me he understood and told me to calm down. I can't help wonder that if my over emotional reaction to that customer is something
To do with my past experiences because sometimes I do get upset about things that I know I shouldn't but they hurts deeply and I don't know why. The bullying toughened me up and god knows- I needed it but now I have days where I feel invincible and nothing anyone else can say will get me down and others where the smallest thing will. Maybe I just bruise easily- I'm not sure. The colleague who I work with on Saturdays was really good about and he was telling me ii shouldn't get down about stuff a customer says which I know but I couldn't help it. He asked me why it had upset me do much and I couldn't answer because I didn't know, but reflecting on it later, I have come to the conclusion that this is in fact the reason for it. The bullies used to go on at me in the same aggressive way that customer did and maybe there was a trigger there. STOP AND STAND UP for yourself to the bullies.