Dear Pins,
Welcome to SR. You have landed at the right place. There is already good news for you. a. ) You have at least sensed or acknowledged that you have a problem. b. ) You have made an attempt to reach out for help. This means, you have already started your journey to recovery. Yes, it may be long,tough and painful journey but the results will be really rewarding.
Pins, remember that you are really at young age and you have a full life ahead of you. If you start drinking at earlier age and continue for may years, it will be really tough to quit at later stage.
You will get lots of support at this website and I can vouch for it through my own experience. Keep visiting this website as it is a wonderful tool.
Regarding you question on how to go about it, first of all you must consult your doctor and open up everything . Make a plan though a in-patient rehab and safe detox or as per your doctor's advise.The best approach is to eliminate the root cause of depression which is both, the symptom as well as the probable root cause of alcoholism
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There are many support groups and alternate recovery methods. You can also read " The big Book " from AA and understand why do we have no control on our carving for alcohol once we have our 1st drink.
All the best.