Hello :)

Hello, my name is Barbara, I am a 23 years old italian girl. I am here to better my english in order to become more fluent and learn more phrasal verbs and idioms. I hope you can help me. Thanks in advance :)
In return I can give you a hand with italian or / and spanish.
Barbara

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This was gramatically perfect but it was very formal! Hahaha like you were speaking in front of a class!

Hi, I'm Barbara. I'm 23 and I'm from Italy. I want to get better at English and learn more idioms and phrasal verbs. I hope you can help me!

So when we aren't in formal situations, we use contractions A LOT. "I am" sounds really stiff so saying "I'm" is more natural. And when we talk about foreign nationalities, it sounds prideful to say "I am Italian." I don't know why that is but to Americans, it almost always sounds better when people say, "I'm from Italy."

I wrote "get better at" because that's sort of an idiom. Saying, "to better my English," sounds too textbook, almost like your honor rests on your English skills! Haha. So we say, "I want to get better at X."

Hello :)

Hello, my name is Barbara. I am a 23-year-old Italian girl. I am here to better improve my English in order to become more fluent and to learn more phrasal verbs and idioms. I hope you can help me. Thanks in advance :)
In return I can give you a hand with Italian or / and and/or Spanish.
Barbara

Después devolver leer la entrada Wikipedia "phrasal verbs", regresé para corregir tu entrada. Nunca había escuchado este término antes, sino solo "prepositional verbs". 

No se usa mucho el verbo "to better" en inglés. Es más común decir "to improve" para significar "mejorar". Una excepción es el uso reflexivo de "to better oneself" que significa mejorarse.