This is my first try usingof this site.

Three months ago I moved to the US, and I feel that my language is one of the barriers that keep me at a distanceability is among the barriers alienating me from from others.

I am a good Arabic writerwriter in Arabic and I really hope to write eEnglish in a good waywell, especially thatsince writing helps me a lot in mwith my daily life.

I hope I haven't misunderstood the last part of this sentence, which is not grammatically meaningful as it stands. "That" in this case is analogous to the relative pronoun الذي.

As I said in the beginning, this is my first time using this site, a. Any suggestion would be very useful.

I can understand English very well, but it’s hard for me to expressing my self clearly.

Three months ago I moved to the US, and I feel that my language is one of the barriers that's keeping me at a distance from others.

A bit more natural

I am a good Arabic writerwriter in Arabic, and I really hope to write english in a good way,well in English too, and especially that writing helps me a lot in my life.

A bit more natural.

As I said in the beginning, this is my first time using this site, a. Any suggestion would be very useful.

Comma splice.

I can understand English very well, but it’s hard for me expressing my self clearly.

Wow!! This is great!! What do you mean "can't express myself correctly"? You're doing fabulous!!

I am a good Arabic writer, and I really hope to write eEnglish in a good way, especially thatsince writing helps me a lot in my life.

Because "that" (in this case) would be used to clarify or clear some things up not the connecting word before an explainer. Instead use "because", "cause", "since", or you're trying to fit in and want to use slang in writing---> use... 'cause.