How do you know if you're starting to get dependent on alcohol?

I spent my freshman year of college drinking three times per week without fail. Now in the summer I drink only about once a week. I'm starting to crave alcohol for the first time in my life, I seem to want it just to want it, rather than for its effects of that makes sense. If anyone knows, how does the process of getting dependent on alcohol work/feel?
How do you know if you're starting to get dependent on alcohol?
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