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.