skidded on water

hi. i have just submitted a claim to my insurance company after my back end skidded on water (it was throwing it down with rain, police said they can clearly see where i skidded and water on the floor)  After skidding, i lost control went onto the other side of the road and rolled my car. Nobody else was hurt or involved at all. I have walked away with very little injuries and it looks like my car will be written off. I have now noticed that on my insurance claim they have said i have admitted liability. Is this right? because there is nobody else involved - am i automatically liable? Other than put my breaks on i did nothing wrong, i was within the speed limit, had my headlights on, doing everything right. I am new to this, never claimed on anything before and don't know what difference it will make if i am liable? Although i was still shaken when i rang my insurance company, when they asked if i took liability, i said no as it was out of my control! please help!