It struck me today what would be the word for confused people. One of my friends is always confused in her daily life, she just can't decide what to do. If I call her, saying "you're a confused person" then it sounds more general. I am just wondering is there any single word for these kind of people?
Clueless. It's difficult to come up with a much better definition that the description in your question, but this one fits:
clueless, adjective. Unknowing; utterly bewildered by life and events.
(Not to be confused with the movie "Clueless," whose protagonist actually was not. Clueless, that is...)
I think there is no big mystery here. True if you say
You are confused.
That implies transitional state, a state that has a specific duration. However, if you say
You are easily confused.
The this is a characteristic and you can use it to describe someones character (as permanent as it gets).
Finally, a common word for a person who is having problems deciding is indecisive.
I would called such a person an addlepate. Merriam-Webster unhelpfully defines that as one who is addle-pated, which it then defines here as someone who is mixed up or confused. Addled is shorter if you want an adjective.
This term is nicely archaic and not derogatory, so you can fairly safely use it of your friends.
A state of confusion and being unable to decide what to do are different, I think. If the primary characteristic that you're trying to label concerns making decisions, then I'd agree with Unreason, indecisive is probably appropriate. But I'm not sure people without specific medical conditions would realistically be permanently confused. Some people are more prone to confusion, or to being overwhelmed. Maybe detached? Maybe disengaged? Or perhaps *aloof?