It's my time vs It's my turn? Also, it's time for me?

I would only use "It's my turn" if others were competing for a chance to do the same thing and only one could do it at a time.

I would use "It's my time" if something had a particular place in your schedule.

So, can I say it like It's my time to do something. For example, I schedule my time at 2 pm to read book tomorrow. Then, the next day at that time, maybe my dad suddenly calls up to me he tells me to help him wash his car, so I reply him "Dad, I can't , because now it's my time to read book.Maybe next time." Is it correct?

Exactly! Not that that's what I would tell my father, but you're using the expression correctly.

Thank goodness, so, how about" it's time for me"? Are they interchangeable?

Like "Dad, can't, it's time for me to read book." However this one, I think we say it when we didn't plan for it the previous day. Just a little bit more, I'm starting to get the grasp of this thing, it's time for me and it's my time, are they both can be used interchangeably? Or each of it has it's own different condition?

Pretty much the same, if that helps at all. If I say "It's time for me. . ." to do something, It kind of implies that I have a responsibility to do that thing. It's kind of a matter how each expression 'feels' or sounds. "It's my time to read a book" sounds like I want to read and it's my privilege to read it now.

The distinction is minor and in conversation it isn't worth much stress.

Yeah! That's right! I have been thinking that, but I'm not sure if i'm right. Thanks for the help. That's cleared everything.