Reduce Peer Pressure:

Pressures to consume large quantities of alcohol often begins long before your birthday. And if not countered early, social pressures will build and become more difficult to resist as your birthday approaches.

The people who attend your celebration will make all the difference in having a fun time. You will certainly want to invite your best friends. But the mix of people will also determine how much you drink. For example, more people might mean more drinks you will be expected to consume and heavier drinkers might increase pressures to drink.
So the key is to make your celebration plans and drinking intentions known early. To counter social pressures could also:

• Be proactive. Make sure the celebration plan is what you want; after all, it is your birthday.
• Let others know your drinking preferences. Share how much you feel comfortable drinking, and what you will and will not drink.
• Counter early and often. Immediately counter all comments and pressures by communicating your plans and drinking intentions, and suggesting alternatives.
• Limit the size of the celebration. as a way to control social pressures, fewer people = less pressure.
• Enlist a friend to help plan your celebration and support your drinking intentions before and during your celebration.
• Appoint roles for friends so they support your plan

Have Friends Give You A Hand To Avoid Negative Outcomes:

See, if you pace your consumption and only drink what you want you can avoid negative outcomes, like blackouts and alcohol poisoning.
Pick someone you trust, maybe even a backup to give you a hand. Let them know what you will and will not drink, how much you intend to consume, and that you want to stay hydrated and eat plenty of food. This person's could:

• Be the non-drinking driver;
• Provide plenty of water, or other fun non-alcoholic drinks, throughout the evening;
• Make sure you eat food throughout the celebration;
• Support your drinking intentions;
• Limit the number of shots you consume;
• Support you when you turn down a drink;
• Consume some drinks for you;
• Ask people not to buy you drinks; and
• Talk to the server or bartender so you only get the drinks you want