Posture problems in unpleasant situations

[1lexis]

Since I was born I've had skin problems because of my eczema. When I was little, this difference wasn't too disturbing, I lived without thinking about it. My mother didn't want me to go out with my friends when I was little for fear I'd get beaten up or something would happen to me, so I stayed at home alone playing the console, reading comics or watching films, and because of that today I'm not at ease with people. When I went to college, people kept making remarks about my eczema, which destroyed my self-confidence. Today I no longer suffer from this skin problem but I still don't have any self-confidence, I'm not at ease with people. So much so that when I'm in an unpleasant situation I become as straight as an I. I don't know how to maintain a normal posture all the time. Thank you for your help