I'm jewish am I more susceptible to becoming an alcoholic?

Less likely. There are moderately strong cultural barriers to jews becoming addicted. For instance alcoholism is very low among jews. It is not a matter of heredity but of social convention. Some young jews do defy these conventions and addiction is possible.
Jewish Alcoholics. Statistically, jewish folks have a relatively low incidence rate of alcoholism, compared to the general public. One reason may be the traditional use of wine, customarily and in moderation used through out the year during holidays and celebrations.