This is the kind of thing you must share with your parents or an adult who will listen and help you. There is medicine and counseling for depression (if that's what you're dealing with) and plenty of resources out there to help you start feeling good and normal again.
Sometimes our body has mood swings and some hormonal changes .Due to this sometimes the situation arises you tend to be sad and lonely and unhappy when you don't actually and sometimes you even cry a loud to burst out their heart.
The difference between disappointment and sadness...Hmm... Sadness is something you feel yourself. Disappointment is when you feel unhappy with a decison someone has made.
Unhappy
I feel blue when i am sick and unhappy.
its an emotion that you feel when stressed or unhappy
You may feel unhappy, tired and have no appetite because you are depressed. You will need to speak to a medical professional as soon as possible.
Maybe because you feel that you are worthless. Or, maybe because you feel that your life has got no meaning, no direction.
Happy means that you feel good and that you are satisfied with something or someone and unhappy means that you feel bad and that you are unsatisfied with something or someone or even that you are mad or disappointed unhappy means when you are uncomfortable with what you feel and can't tell or can't really explain what sadness you feel.
To feel grief is to be unhappy or sad. If you feel grief, you are capable of feelings, and it means that you are a normal, healthy human being.
feel yourself
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I would expect the people to be unhappy, angry and disappointed.