I was a real fucking doomer, I was an alcoholic and a 2 packs a day smoker. I was depressed about some past trauma, and couldn't get over it. My older brother was the same, and killed himself when i was 26. The next week, i realised i needed a change, and that i wouldn't end up like him.
Here's what i did:
1. Go do some kind of sport. I'm not saying you have to turn into chad, but do something, it's proven to make you more appealing to women and increases testosterone. I joined my local amateur rugby club because i'm a eurofag and that's what we play, but i'm sure you could find an amateur club for you. They are generally quite accepting, even if you never played a day of sport in your life.
2. Quit heavy drinking or smoking because it just helps all round. Smoking I quit cold turkey, but i had to go to AA to avoid drinking myself to death, because the addiction was too strong (where i met my wife for the first time)
3. Shower Daily and shave. Got a haircut and washed and ironed my clothes for the first time in years.
4. Save up some money that you got from not drinking and smoking everyday, and go get yourself some nice, modern clothes, stuff that properly shows you off. If you're insecure about your size, like i was, try darker colours, they hide some insecurities and make your face seem thinner.
5. Take up a hobby. This was my last step. When i wasn't playing rugby or working, i needed something to do other than spend hours on Yea Forums, so i started practising and getting good at tekken 6, eventually i got really fucking good, because i was constantly practising.
6. If you did all the previous things, you'll already be happier. Little things make a big difference. If you're actually doing all these things and not missing any of them out, then you'll just have to do the last thing: be confident! Women want a confident man more than anything else.
That was back in 2008, and now i have a beautiful wife, and two kids. If i can do it, you can too, user. Godspeed.