Self-Conscious in Social Situations

Whenever I am I a social situation it feels like I am an actor playing a script of me...I don't know how better to explain it, but its almost like I am looking at things from an outside perspective (not really, but I am always thinking about how everyone around me is perceiving everything I am doing) and the instead of just being able to act naturally and enjoy myself I feel like I am in a spotlight all the time or like I am on stage in a play and that everyone is watching me and judging me on everything I do. I don't know why, but I feel this especially when I am out with my kids and I am talking to them in public. Whenever we are at home and alone it's just very natural and fun but as soon as there is an 'audience' I start feeling really self conscious about everything I say and I am always feeling like people are constantly judging me on my parenting skills. Why am I like this and how can I stop being like this?