I plan to cut my hair.

Today is Saturday, almost everyone have has a the holiday on Saturday and Sunday, but im I do not, I must go to work at on saturday. So I will only have one day to rest, its our company's unpleasant regulation, maybe you will say ask why u don't you quit your job? Because I live in a harsh society,or have another explaination, im not that so excellent. anyway, continue to work,continue to do every routine thing day by day. The last sentence is a bit confusing. Please tell me if this is what you mean.

Because I live a harsh society and I am not very smart anyway, so I continue to work, and continue to do this routine every day. I don't know why you don't think that you are excellent, what you wrote was very nice. I hope that you keep learning English. I hope that I understood what you meant, I don't want to offend you. :(

I plan to cut my hair on Sunday,  I think it's too long and needs to be cut a little shorter.

Days of the week are always capitalized, and so is the word I.