LEAVE! That's what to do.

Here's a link to how to know if it's abuse: http://www.startingpointnh.org/know.html

This has one UK resource http://www.playingtheangel.org/

Here is a UK resource site: http://www.hiddenhurt.co.uk/

Quit questioning. Go to some place safe (generally that means don't tell anyone right now!) If it turns out it really isn't abuse, you can always go back and work things out.

YOU are the most important person in this right now. Be safe.