My first time,

I don't know why, but always I I always (this flows better) sweat like crazy when speaking in English, and my first time using Italki wasn't the an exception,

It would will (future tense) be a dream come true when I stop getting nervous speaking in English. Somebody Does anyone have a good advice to control the my(fits the context better) awful nerves ??
OMG And the worst part is comming, when I get nervous , I speak a LOT, and I cant't structure my sentences (flows better) well any sentence
Maybe I can't structure well because I don't know all the grammar rules.

Your English is very good! Only a few minor errors, but overall your writing is clear and understandable. I can relate to your nervousness with my own language of study, Japanese! Some advice I would give is to slow down and think about what you want to say in your head before you actually say it. Don't feel rushed when speaking just because everyone else is speaking fast. It's better to say things correctly and slower than to jumble your words just so that you can say it quickly. This may be a hard habit to break, but I bet you can do it! Plan out what you want to say before you do it, and I think you'll have a much easier time communicating and less anxiety about the whole ordeal. Keep up the good work and good luck with your English studies!