You have a few things going on here, and some opportunities as well. First I would encourage you to get into the mind-set which would enable you to not care so much about what others may think about your actions. Feeling self-conscious is a part of personality development as is becoming self-confident.
This is a good response, as the anxiety you feel is coming from you. Try and relax and don’t think as you wonder around with a camera. There is no angst; you are merely capturing light in a little box. Hope this doesn’t sound patronizing and hope it may help.