I am not confident inabout my health, but I still hope I can live longer. I am not confident about my health, but I still hope I can live longer.

I am not confident in my health, but I still hope I can live longer. I am not confident in my health, but I still hope I can live longer.

I disagree with the other correction. i think both are acceptable.

I don’t ever know how to enjoy life, i. Instead, I just want to do as many things as I can. I don’t ever know how to enjoy life. Instead, I just want to do as many things as I can.

I don’t ever know how to enjoy life, i. Instead I just want to do as many things as I can. I don’t ever know how to enjoy life. Instead I just want to do as many things as I can.

Life sucks,; it’s difficult to be yourself. Life sucks; it’s difficult to be yourself.

You could also make these separate sentences: "Life sucks. It's difficult to be yourself."

Life sucks, i. It’s difficult to be yourself. Life sucks. It’s difficult to be yourself.

You have to meet somebody you don’t want to, and you have to do things you don’t want to. You have to meet somebody you don’t want to, and you have to do things you don’t want to.

You have to meet somebodypeople you don’t want to and you have to do things you don’t want to. You have to meet people you don’t want to and you have to do things you don’t want to.

somebody is singular. If you are referring to a specific person, your sentence would be correct. For example: I hate working with my boss. He is somebody I don't want to meet.

I always think I am right, but is this world wrong?

Ignore my earlier correction. You are correct.

It's definitely not, so I remember an essay written by the famous writer Jia Pingwa: “I am sick”." It's definitely not, so I remember an essay written by the famous writer Jia Pingwa: “I am sick."

Periods almost always go inside the quotes in English.