A sad day

10/5/2015, today i feel very upset because really don't know what should i do. I always serious and try my best to do something well because i am very lack of self confident before, i scare the thing that i do is what that meaningless. So,i become very stubborn and put an important look on what i am doing, but sometimes it doesn't need it. But for my own thinking, i should take serious about the things because it was my responsibilities. I should not just abandon my job, i should give a tell to my group mate but it seems like din't work. I really dunno what should i do,feeling really sad...