My roommate

[The last]/Yesterday evening/Last night, I [were]/was reading a book which was hards to understand.
But my roommate chatted/was chatting with her boyfriend.  I [feel]/felt angry !
because, she [already have disturbed]/was disturbing/distracting me.
I tried my best to stay calm [my mood].  Fortunately, she only chatted for a while.
The thing reminds me of something. I think we should [stand different angel to]/move away in order to respect people, in particular , when someone needs to do reading !

My roommate

The last evening (Last night), I were(was) reading a book which (is) hards to understand.
But my roommate (was) chatted(chatting) with her boyfriend. It feel(made me) angry/(upset) (you could also say very angry)! Because, she (has) already have disturbed me (before?). (OR: ...she already has been disturbing me)
I tried my best to calm my mood. Fortunately, she only chatted for a little/short while.
The thing(situation) remind (reminds/reminded) me of something. I think we should stand at a different angel to(and?) respect other people. In particular (OR: Particularly...) , someone (who) needs to reading! (OR: someone who is reading)

(You could also say: 'I think we should place ourselves in other people's shoes(OR: situation) and respect them more'  OR 'I think we should pay more attention to others and give more respect to them')

(TIP: Was is used in the first and third person singular (I, he, she, it). Were is used in the second person singular and plural (you, your, yours) and first and third person plural (we, they). 

Good job! 😊