Embarrassing Day.

Oh, today I was on the teachers meeting in school and I was introduced as a new art and handicrafts teacher. I'm afraid! It's such a huge responsibility! But it's a very interesting job. Wish me "good luck"!

I was embarassed because my teachers are now my colleagues. Yes, I'm not the only art teacher in school there is another one. She told me "Don't afraid, I'll help you". 

Thank's a lot for your wishes!

Embarrassing day (why embarrassing?)

Oh, today I was on the board of teachers in school and I was introduced as a new teacher of art and.. how it in English?... This lessons about how to do things by your own hand. In Russian it's "труды" or "технология". (is it 'handicrafts' 'ремесла' ?) I'm afraid! I feel really nervous! It's so such a huge responsibility! But it's a very interesting job. So, wish me "good luck" :)

Good luck! Удачи!

Corrections in red.  Stylistics in blue.

Embarrassing [1] Day

Oh, today I became a member of a school's faculty, [2] and I was introduced as a/the [3] new art teacher.  How to say/explain it in English?... The lesson was about how to do things by your own hand.  In Russian, it's "труды" or "технология"(handicrafts).   I'm afraid!  It's such a huge responsibility! But it's a very interesting job.  So, wish me "good luck" :)

[1]  Something that causes embarrassment is "embarrassing".  The person who feels embarrassment is "embarrassed."

[2]  It was a little hard to understand what you meant by "was on board of teachers".  I think you meant that you became a member of the school's faculty.  In English, in the context  of schools, the "faculty" is usually the преподавательский состав.  

[3]  If there are other art teachers besides you, than the article "a" (one) is correct.  If you are the only art teacher in the school, then "the" is correct.

I wish you good luck!

An Embarrassed Day [I prefer, "A Day in Fear and Excitement".  There is nothing to be embarrassed about]

Oh, Today I was on the board of teachers in school and I was introduced as a the new art teacher of art in school and... How to explain it in English?... This lessons about how to do things by your own hand. In russian it's "труды" or "технология". [Sorry, don't understand even with the mechanical translator.  However, it is not essential in your essay.] I'm afraid! It's so such a huge responsibility! But it's Still, a very interesting job. So, Wish me "good luck! " :)