I've just started a new teaching job and feel really isolated by my new year group team. They didn't even talk to me properly today and only said a quick "hi". To make matters worse, I got really excited as I spotted an old school friend and decided to say a hello how are you to her... But she refuses to recognize me... I feel so down as it's a huge leap to get back to work full time with my own busy life with kids. Why do I feel so depressed?