I absolutely despise alcohol
What is your reason for despising alcohol so much?
Because drinking it makes me act like an asshole.
It's good that you realize the negative effect alcohol has on your behavior and for you to dislike it. Though many people drink alcohol, many others also abstain from drinking and it is perfectly okay to do that.
I just feel like a loser for not drinking it now.
It is fine for someone to not want to drink alcohol. This sounds like a responsible decision in my opinion if the person knows that it makes them act bad.