Translation of nervousness in Spanish

You can always write me and we can learn together any language you want. How long you have taken classes? Was it only at night or on weekends? Makes me wonder how someone can be so fluent in Spanish.
You can return the favor and help me too. We will acquire the new language together. I like to learn Spanish. Since high school, I have learned much more but it has been more than 20 years ago.
I'd be very happy if you could correct my Spanish. In return, I'll help you too, of course. 3 years ago I traveled to Chile to visit the country, only for a month, unfortunately. Loved the Cordillera!