Here we have a poorly written text with quite a few mistakes:
Why oh why did I do that mistake? Of course the good answer was “interested in”! But I wrote “interested by” instead of. And I had a lot of others silly mistakes too. I know I will fail the test and will have to repeat the course. I should really stop to go out with my friends every evening. I should stay in home and work my lessons. I feel so miserably!
Our task for this workshop is to find the mistakes and write an improved version of the text.
Why did I do this mistake?
Of course the correct/right answer was “interested in”!
But I wrote “interested by”.
And I also had a lot of other stupid mistakes.
I know I will fail the test and that I should learn and keep learning my lessons.
I should really stop going out with my friends every evening.
I should stay at home and work on my lessons.
I feel so pitiful!
“Pitiful” is not a good choice here.