I think I am not so optimistic how I want to beSUGGESTION: Avoid using the word "I" 3 times in the same sentence when writing. When speaking, this is fine. However, written English is different from spoken English. RECOMMENDED WORDING: It seems that I am not as optimistic as desired.

I dream aboutoften imagine sad situation wheres in which I lose.

ButHowever, I know that the "muscle of joy I" can increase - maybe today is not very good, not all is well and I am not pleased with myself, but tomorrow I can try to change anythingbe exercised through positive input. Maybe I am not very adept at positive thinking, but I can am trying to change my attitude.

Sorry, my sentences are not happy today to write something with a noir tune.

VOCABULARY: noir → 濃く　(Cf. https://academic.oup.com/edinburgh-scholarship-online/book/37259/chapter-abstract/330421385?)

I think I am not so optimistic how I want to be.

I think I am not very optimistic as I want to be.

I dream about sad situation where I lose.

I (think) about sad situation of when I lost.

I think I am not so optimistic how I want to be.

Can also say "who I want to become"

I dream about sad situations where/in which I lose.

But I know that the muscle of joy I can increase -grow — maybe today is not very good, not all is well and I am not pleased with myself, but tomorrow I can try to change anything.

- – — all have different purposes
- is for connecting nouns
– is for ranges of dates/numbers
— is for adding pauses and breaking up sentences

Then, the below two phrases have different meanings, just wanted to double check:
"not all is well" → not all = some things are well
"all is not well" → nothing is well

I think I am not so optimistic about how I want to be.

I dream about sad situations where I lose. / I dream about a sad situation where I lose.

But I know that I can exercise the muscle of joy I can increase - maybe today is not very good, not all is not well and I am not pleased with myself, but tomorrow I can try to change any(something).

Sorry, my sentences are nory isn't happy today.

I think I am not sovery optimistic about how I want to be.

I dream about sad situations where I lose.

But I know that I can exercise the muscle of joy I can increase - maybe today is not very good, not all is not well and I am not pleased with myself, but tomorrow I can try to change anything.

Sorry, my sentences are not happyry is not positive today.