You're very brave OP, admitting all this - so that's the first step.
Ignore you're friends - just because they drink similar amounts is irrelevant - they are taking a huge risk with their lives. By you taking this step, you're holding up a mirror to their drinking. True friends will support you and be onside.
Right - you need to change your mindset, you are not losing anything, or giving anything up here - you are reclaiming your life, your health, your happiness. You are worth this.
You're in the dark place of heavy drinking, drowning in it - you say you don't get hangovers - here's the thing lovely, wait until you've been sober for a couple of weeks and look back at how you feel then, and how you were before - you'll have far more energy, your sleep will be restorative and deep - you'll have a spring in your step and (what amazed me) is that the anxiety vanishes.
Right now you're a drinker about to make the leap. You are scared (of course - hell, I was!) Many people quit, can't cope with a couple of roughs weeks - think "well if this is sober, sod it, I was better off before" and drink again. They don't give it long enough to feel better.
Once you feel better, that will keep you motivated, you'll cling onto your sobriety because suddenly life is so much better.
You can do this.
One day at a time.
Just forget about "quitting" or being alcohol free forever.
Every morning say to yourself, "Today, I won't drink."
Then next day, start again.
You've got this - but don't think about what you might lose. Think about what you will definitely, absolutely, gain.
Lean on us.
Soph 