I know a lot of people get self-conscious about starting the programme and being seen running outside so here's a little anecdote.
I was running though the park the other day when I spotted a friend (who lives nearby) walking the other way. If I hadn't yelled "morning!" at him I swear he would never have noticed me and even then it took him a second or two to work out it was me.
So there you go. You can run past someone you've known for 20 years and they won't even see you. You are to all intents and purposes invisible, so don't give it a second thought.