Do I suffer from a lack of confidence, social anxiety or depression?

Anonymous
I have begun a course, everyone is mixing and i am feeling left out.
We were in a group of 9 people today and 1 girl said that i've barely said anything, and i felt like i have nothing to add to the conversation. It was so embarrassing.
Then, when i did talk, people didn't acknowlage or pay attention to me so i just felt so awkward and wanted to leave.
At break, i go out, i stand there, near every1 but they all talk, i dont.

Whats it sound like here?
Updates
+1 y
I did feel very insecure about the clothes im wearing, the body shape i have and my hair style.
Do I suffer from a lack of confidence, social anxiety or depression?
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