19 yo male here. An 'addict' of daydreaming since I was around 13, with strong strains going back to as far as 5 years old (maybe back then it was healthy).
I've only recently begun to try to get rid of the problem, actually less than 3 weeks. I suppose I have AvPD, though it is hard to say not only because it is a self-diagnosis but also because I'm so withdrawn from social contact that I can only infer symptoms from old experiences.
What is certain is how terribly the fantasizing has overtaken, leading to my recent realization that I have accomplished NOTHING with my life, other than in my own head.
Although this place looks pretty empty I am glad I'm not alone with this problem and that I might actually find a way to stop living in fantasies :)