What the f dude, aren't you the one who posted the material, audiobooks, stuff, you know, self help material and always seemed to think positive... yeah, it's you, I just checked on your profile, lol.
Come on.
I recently discovered a new method, I am trying it out, whenever I remember it, and it's "Lower your expectations by not expecting much from life, but at the same time try to do the best you can".
That means a lot of things. Think about it. Do you expect someone you've never seen before to ring your doorbell now and tell you "hey, wanna come along?" or every girl that crosses your mind to magically appear in front of you and say "I love you! Let's have fun together!"... Do you expect such things? Because I often do dream of such unlikely things, and now I know they are just dreams, too unlikely. Why should anyone come and see me if I don't go out in the first place? Why should anyone fall in love with me if they don't even know me? Why do I even expect such things, you know. Think about your expectations, and then be realistic and notice how stupid some of them can be. Then don't expect much, and do what you think is best anyway.
Just do it and don't expect much in return. You'll often get something in return but it won't be what you were dreaming about. Accept it anyway, because it'll be good and it'll be better than nothing. No one can have everything. Lower the expectations.
I hope this will help you (and myself too). It's hard, I know, but there aren't many other solutions I'm afraid...