You're allowed to read first

Alcohol is a depressant drug that slows the brain and nervous system. In small amounts it lowers inhibition, which is why it can feel like confidence. In larger amounts it takes coordination, memory, and judgment with it.

Two things are true at once: most people who drink don't end up in crisis, and alcohol is the drug most likely to cause serious harm across a population. Both facts belong in the decision.

If you want the mechanics first, read what alcohol actually does.

The brain keeps developing into the mid-twenties, especially the parts that handle planning, impulse control, and emotional regulation. Alcohol interacts with that process, and the earlier regular drinking starts, the more likely difficulty with alcohol becomes later.

That isn't a moral point. It's a timing point — the same amount of alcohol does more to a developing brain than to a finished one.

Nobody starts drinking planning for it to get out of hand. It usually happens gradually, through a mechanism that has nothing to do with willpower:

• Alcohol releases dopamine, which tells the brain this is worth repeating.
• The brain adapts to regular alcohol — tolerance — so the same amount does less.
• Doing less means drinking more to get the original effect.
• If alcohol is also handling stress or anxiety, the reasons to drink multiply while the effect shrinks.
• Some people are more susceptible from the start: family history, anxiety or depression, trauma, or simply how their brain responds to the first few drinks.

You can't know in advance which group you're in. That's the honest answer, and it's a fair reason to be careful rather than a reason to panic.

• "Everyone my age drinks." People consistently overestimate this. The share of young people who don't drink at all has been rising for years.
• "Beer doesn't really count." What counts is the amount of alcohol, not the container.
• "Handling a lot means I'm fine." Needing more for the same effect is tolerance, not strength.
• "A drink calms nerves." Briefly — and anxiety usually rebounds higher as it wears off.

There are more of these on the myths page.

This isn't a how-to guide, and it isn't permission or disapproval. But information beats silence: alcohol affects you faster on an empty stomach, mixing it with other drugs or medication is where most serious harm happens, nothing sobers you up except time, and never drive or swim after drinking. Tell someone where you are.