Drinking too much is pretty unpleasant. The room spins, you get sick, slur your words and lose your memory. Some people get stroppy and aggressive.
The day after a drinking session you'll probably get a hangover. You might feel sick, thirsty, tired, washed out and a bit low.
What are the health effects?
The UK government has set guidelines on limits for healthy drinking. These are a maximum of 21 units a week for adult men (over 18 years), 14 a week for adult women. The limits are lower for under 18s. And remember the guidance is in relation to a whole week - drinking all your units at once (binge drinking) is definitely not healthy.
There is 1 unit to half a pint of weak beer and 2 units in the average alcopop.
Drinking alcohol increases your chances of having an accident of some sort. Or doing stuff you'd regret the next day. Stick with mates who will look out for you.