Well, you must have clicked yes, otherwise it wouldn't have changed
It's highly annoying, it's pretty much becoming mandatory by the looks of things. Can you not change anything under your account settings? Linked accounts etc?
Yes, it's added you as a page, so you clicked the button.
I've accidentally clicked on that today and when I went to delete google+ thing, it wanted to delete all my youtube videos too together with it. Now I'm stuck with it. I use a separate account for YT, so there isn't my name or any other personal info. Google+ is a complete fail that must be why they're forcing people to use it.
I didn't click it, so it's forced it on me as per the title.
If you clicked no, it wouldn't have forced it upon you. You obviously mispressed it, whether it can be reversed I'm unsure.
I've had it many times, and still haven't had it forced upon me, I keep pressing no.