Corrections in red; stylistics in blue.
First post
Well, I don't know, what to write here, but I'll try.
Hi, my name is Yuri, and I'm trying to learn English. I'm not sure [1] about my English skills.
Next week I'll be interviewed for a new job in English, and I'm so nervous about it. :(
[1] Good variant: "I'm unsure about my English skills."