Although I sort of had a cold, I forced myself to go to work.
But in the end, I couldn't do very much work, because I was feeling sick.
As a working adult, I failed and feel bad about it.
ご質問ありがとうございます。
"Although I sort of had a cold,"＝「少し風邪をひいていたけど」
"I forced myself to go to work."=「無理に仕事に行った。」
"But in the end, I couldn't do very much work,"＝「でも、結局、仕事はあまり出来なかった」
"because I was feeling sick."＝「具合悪かったから。」
"As a working adult,"＝「社会人として」
"I failed and feel bad about it."＝「失敗した。そして後悔している。」
お大事に！
アメリカ合衆国 
