Sad!!

Felling Kinda sad today I don't know what has come oever me but its not good I guess i'm feeling lonely I don't know its sad though.. My God has been so good to me I mean even today is Just so beautiful He did this just for me He allowed the day to be as it is allowed me to have a Job and to be alive so then please tell me why am I sad today?? I just don't understand??