I would recommend all the same corrections as the previos poster with one change:

Last month, I went to Ireland. Dublin to be exact. 

That phrase sounds more natural than using "exactly."

Also, I agree that travel allows you to make awesome friends! I loved Dublin too when I went there!

Hello everyone

Hi there! My name is Simone, and I'm 22 years old. I want to improve my English and become fluent. I know that's not easy on my own, and in a country where nobody speaks English, but I'll try.
Last month I went to Irleand; Dublin to be exact. I stayed there for about 2 months, and it was best experience of my life. Dublin is so beautiful and people are so friendly. In fact, I made a lot of friends all around the world.

Note: Some of the things I corrected were not necessarily wrong, they just could have been phrased better, such as in the third sentence. Also, the "I made a lot of friends all around the world" part in the last sentence seems to be disconnected to the previous sentence, so try for a smoother transtition. For example: "In fact, I made many friends there, as well as many friends from all around the world."

Hello everyone

Hi there! my name is Simone, I'm 22 years old. I (wanna) WANT TO/WOULD LIKE TO improve my English and I want to become fluent(.) I know that's not easy on my own and in a country where nobody speakS english(,) but I'll try.
Last month (i have been in) I WENT TO Irleand, Dublin exactly(.) I stayed there about 2 months and it was THE best experience of my life. Dublin is so beautiful and THE people are so friendly(.) In fact(,) I made a lot of friends all around the world.