I don't know what  how to write a composition, I just want to write down my mood now (what I feel ; would be a better option)

I was very sad today because my parents wanted to put away matty Because because (upper cases of letters are not used in the middle of a sentence; without a full stop) they think the dog will bite it  and the bacteria will endanger our health. (However, there is a factual error.)

I don't know what to write a composition? I just want to write down my mood now

I was very sad today, because my parents wanted to put away matty Because they think the dog will bite, its bacteria will endanger our health.