Sweet Home and Melody

Apparently, it makes my mood really bad. No mood to study. No mood to do anything.
Not only my interview thing, but other thing seems went wrong.
I really don't think enjoying what I'm doing now. Somehow feel rather a burden and responsibility.
I think I should learn to admit mistakes, admit what I did was wrong, admit the reality, admit the environmental restriction and rules, try to get use of it.
But I do want to clarify if not fully my mistake though. is it wrong?
I just somehow feel sad though. knowing the reality that did it was not some stranger.

God please help me to learn to admit my mistake
learn from past experience
learn not to take anything so seriously and get my self so down
learn to not so easy to be sad due to small thing
learn to not so sensitive
Tell me what should i do...