Now try taking photos head on. You'll find it's better for your photography and social skills. Don't say you like people's backs better. It's really hard (for myself as well), but is what makes a great photograph!

Look at @chrissymchavez for inspiration - he followed this advice and became an excellent street photographer. Even though I've been taking street photos for quite some time (and consider myself a street photographer), he impressed me how quickly he got over his fear of facing people and starting posting some excellent work!