Great response. Few minor errors though. You should say 'persevering and single minded'. Consider the following:

"Hello. My name is Scarlett Yulia. I am from Ukraine. I am a very persevering and determined personality. I am very focussed when I take up a task. I understand that English is the language of global communication and that's the main reason for my decision to learn it. I would like to know and learn more than what my tutors demand. Also I have many relatives who reside in USA and I hope to visit them sometime in future. I am confident that italki.com will gradually help me to improve my knowledge of English and I will become fluent in the language. Thank you."

Hope it helps. Regards.

Anas