I've been reading the guides out there for years and I don't do any of the classic mistakes that I'm aware of. My best guesses are that, in addition to a few physical flaws (nothing major) it's about changing expectations of women. I'm 35 and I look 22 and still act like a kid in some ways and am quite socially awkward. I don't think I have the verbal skills to pull off those moves where you put on a puppet show in order to push the right buttons and fuck women, and that's not what I want anyway. (I'd like nothing more in life than to meet a single woman who was attracted to me and with whom I could be myself with.) I have a personality where I don't take bullshit from anyone and if I'm asked a question I give the answer. Everyone I meet likes me and I hear lines like "You're smart and interesting but I don't know if the chemistry is there" consistently.
I've been doing things like internet dating, speed dating, a salsa classes, and I'm a pretty accomplished singer, and some guys actually have to try pretty hard not to attract women doing these things!