how do you carry yourself with confidence

[c=804600][i]in public, i am usually very nervous, self conscious about myself, feel embarrassed, soon get unnerved and panicked and just feel not at ease, this is due to my ptsd and self confidence problems..

i have to go out shortly to get groceries, i will be wearing my red lacoste jacket, a colour i'm not used to wearing, i usually wear black clothes, black hoodies etc...so how can i begin to carry myself with confidence and not feel so scared of people and what they think?

i'm also bald and have a black moustache.[/i][/c]