Diary Entry for December 13th

She told me how boring it is to deal with a lot of trifles day by day. (this sentence is kind of awkward but the grammar is now correct I think)

How dreadful the morning rush is. She felt tired and couldn't show her value(prove her value/worth) in this job. I only had rare social experiences(?). So I didn't know what to tell her. But I thought to be an adult，she could be responsible for her choice.

maybe: But I feel that as an adult, she should be responsible for her own choices.  

As a friend，what I should do is give her support！

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And here are the numbers:)

1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th, 12th, 13th, 14th, 15th, 16th, 17th, 18th, 19th, 20th, 21st, 22nd, 23rd, 24th, 25th... (etc)

It is th for 10-20 but then any number ending in 3 after that is rd (23rd, 33rd, 43rd, 53rd, 63rd, 73rd) 

Diary Entry for December 13rd

Dahlia, great job! In the 5th sentence I suggested changing "recently she is busy because she has been..." to "...she has been busy because she has been..." to keep the tenses consistent. I'm curious as to what you mean by you having "rare social experiences." Elaborating on that could help readers understand the context a little better, but I think all the points you are trying to make can be understood. Congratulations!