A 250ml glass of 12.5% wine is 3 units, flatbum. Bear in mind that most people pour larger measures at home and that 12.5% is quite weak for a wine now, so it is likely you are regularly exceeding your weekly recommended allowance.
Drinking outside of these limits increases the risk of long term health problems; cancer, heart disease, diabetes and more. The more you drink outside the limits, the higher your risk. There's also the mental health risks of moderate/heavy drinking; dependence, depression and anxiety. 'Alcoholic' is a more complicated diagnosis than just how much someone drinks, but it sounds like you are drinking more than the guidelines and it might be worth looking at reduction strategies, taking a couple of days off between drinks etc, to lower your risk in the long term.