MY DATING DILEMMA?!?!?!?

im 19 (male) and im horrible with girls, i dont even know where to start, the only girl i was able to get was a slut that cheated on me and was probably only with me so she could use me (she took my virginity) i dont know how to talk to girls, i dont know where to start, i dont know how to go out and meet girls (im kinda detached from society) girls simply do not want me because i guess i "dont get it" im naturally a nice person (i dont expect more out of life because of that) but girls HATE nice guys. I read this thing about "genius failure paradox" and its about smart guys that cant get women, it explained every problem i have, but the problem is instead of using that advice it makes me realize my problems and hate myself for how pathetic with girls i am, im 19 i should be able to get women....but i cant, i feel like a clueless idiotic immature moron who will never get it and has a SERIOUS problem, what should i do