I hate drinking alcohol but i can't help it. why is this?

This is not a good: Thing. If you believe that you have lost control over your use of alcohol - that is a red flag. It you have tried to cut down on use or to quit unsuccessfully - that is another flag. If your used is negatively impacting your life - pay attention. Alcoholics anonymous is a free, confidential forum to deal with addiction. You could also see an addiction medicine specialist or addiction psychiatrist.

Genetics?: Look up Dr. Kevin McCauley, who makes a strong and cogent argument that addiction is - at it's core - a brain disorder, resulting in a disease. Critical to this is a higher than normal pleasure response to the addictant (related to beta-endorphin responses). You can "help it" but you might need a sophisticated framework to understand how this works in your life. There is hope.

That is a sign: that you are addicted to alcohol. You may have a genetic disposition to the disease. Get help, AA, psychotherapy can help you fight the disease.