Do I have depression? If yes, is my condition serious?

Hi i've been being emotional and moody almost every day and slowly i realized that these happen:

-prefer to be alone (sometimes)
-feels extremely annoyed when it's noisy (sometimes)
-no appetite (sometimes)
-sad for all day
-feel very very unworthy
-desire to die (kind of)
-thought of suicide
-cry without knowing why (sometimes)
-very very insecure
-feels lost, useless and perplexed

Does that seems like i have depression? :/ if yes, is this serious? what should i do?
Do I have depression? If yes, is my condition serious?
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