help me boost my social confidence?

[Steven]

when ever i know i have to go out, even to the shops i start worrying and panicing, thinkinhg things like oh no what if i make a fool of my self or do something stupid that will make people see me differently, when i am out of the house and on the way to the shops or what ever i have a big boost of confidence and i am not fazed by what will happen, its just pre action nerves. i feel snug at home and in my confort xone and hwne i think of the big baad world i get scared, when i am out i have the confirnce to talk to girls and everything which has been commented, but i just panic when im in the house and think about them, how can i get over this pre action fear because its destroying my life? thanks