You can only dream about girl friends if you were to do nothing and just dream about having one but if you step up to it and seek for one then one may come for you.
You can say "Oh no it will never happen." But that is because you believe that it will never happen.
Try hard. It is just like studying: you can get good results by study hard (also the right way), same goes for love but finding the right way to do it hard.
Yes, looking for a girl is hard but you can do it (not impossible).
Also you can feel that you will/should become a single because I want to stay single as well.
Although I do not daydream about girl friends but I do have feeling of being a single forever.
However, that is because I wish to be a single.
In your case, it might be the fear: fear of reality, fear of responsibility, fear of rejections, and such.
You just have to move aside from those emotions and find the true love.
But if you want to stay in your dream, then it's fine too I guess.
Everyone has there own life and it's their choice.
They can be a drug addict, alcoholic, normal, virgin, player, etc.
It's their choice and you can't really do anything about it (unless they want help or they are hurting others).
Mmm but you know love is not about thinking though... Your negative thoughts could be holding back on your feelings.
Remember love is mostly about feeling, not about thinking.
Hope it helps.