I can't do anything right, how do I tell my girlfriend?

I have an online girlfriend, and she's very sweet with me. But the problem is, well, everything. I've been in a depression for the past 6 years, I've failed at everything I've ever tried in my life, and I can't do anything right. It's gotten so bad that I've given up on trying, anymore. I've resigned myself to staying in bed, drinking until I throw up and pass out, then repeating the process when I wake up.

I deliver food for a few hours, once I run out of alcohol, then immediately get more once I've made enough money. She knows I'm struggling with alcohol, but she doesn't know how much I've had. For the past 2 months, I've been consuming alcohol every day, I never consume any less than 10 standard drinks each day, and it's quite common for me to drink more than 20 standard drinks each day.

Last night, I drank 17 standard drinks worth of alcohol. But here's the thing, I can't even get drunk, properly. Because at no point last night, did I feel the giddy feeling of being drunk, I just fell asleep and woke up trembling and twitching.

I don't enjoy anything, and I have no passions or interests, everything is painful to me, and I can't even summon the energy to shower.

She deserves so much better than me, but I don't know how to tell her. I know that once I tell her that nobody believes in me for good reason, she'll reply that she does, but then I'll have to tell her what an insane fool she must be for thinking, even for a second, that I'll ever be able to become anything more than a worthless drunk who can't do a single thing right.

How do I tell her?
I cant do anything right, how do I tell my girlfriend?
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I've decided that I'm going to stay with her, and give life a few more tries
I can't do anything right, how do I tell my girlfriend?
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