Hey flavinho,
I was there before. I am an introvert with depression and ADHD. But I'm sober thanks to AA. After getting sober I was much more able to deal with the other issues. I needed a support group because it is so much easier. BTW, the big book of AA speaks of exactly the loneliness that you and I are familiar with. It was a torture in my case.
Go the next AA meeting in Sao Paulo. I'm sure there are plenty there, just give it a try.