Alcoholism really is a serious issue these days, it affects alot of people and can really cause issues such as unsafe romances or drinking and driving.
I am somewhat addicted to alcohol too. What do you think i can do about it?
Have you considered talking to someone to help your addiction to alcohol?
I do not know who talk to. I am helpless. 
Your not helpless but there are plenty of people to talk to! Alcohol anonymous groups, support centres.
I will try those people. But what is the bad effect of alcohol if i do not stop?
Damage to your health, emotional and mental heath issues. The longer you are drinking it for, the harder it is to stop. 
Which of your organ is at risk when you drink so much?