I had to throw my lab notebook away because it was ruined
Why was your lab notebook ruined?
I felt upset because I lost all my ideas for my experiments
That must've been really frustrating to lose all that hard work. You have to be so careful handling your notes and papers for school.
I was in a rush to get to school on time so I can't be bothered to put it away.
You should use this experience as a lesson in maintaining your notebooks. It would take less than two minutes to put your notebook away properly and save your work.