What if you did your best to have a relationship and nothing seems to work out?

I’ve been asking this question for days, weeks, months and years. Honestly I really don’t know the answer that what could possibly go wrong. I am talking about myself. I am 28 yo girl whose never ever had a relationship before. Well just flings. I’ve waiting this long to get my “perfect” relationship for nothing! Yet no one seems to appear on my door. One can say I have high standards and should have lowered it. Someone else can say I give the wrong vibe. Well, it was true then I lowered my expectation and tried to be positive all the time, like smiling, trying to communicate etc..
And later I criticized myself, beat myself up, felt sorry for myself for not being able to have a relationship! Because I thought my flirty and kinda bitch friends can make one easily but I can’t. You know it’s not fair -especially – when all the bitch lover guys marry with the decent girl or end up with the bitch one. So where are my manners? right? It’s just I am pissed off! I just want someone closer. Is that alright?