First of all, let all of your friends and family members know that you hate drinking and request them not to insist you for having alcohol at any occasion.
Try your best to stay away from people who force you to have drink with them in a party. Try to use a soft drink instead of alcohol which will help you in getting your attention diverted.
Your family history can also help you in this regard. Try to know the cases in your family that happened because of alcohol. It will help you staying away from alcoholism.
Do not become vulnerable to alcohol when you feel depressed or are worried for something. Alcohol ends up in aggravating the depression and you will make the matter worst instead of finding any remedy.
Make sure you stay away from beer drinking competitions at school or college. It will help you avoiding alcoholism after you leave the school or college.
Always decline the offers of drinking alcohol in a gathering as it will also help you in staying away from drinking when you are alone.