Ok...what am i doing wrong? Please help?

Ok, let me explain everything really quick.
I started playing this game last Aug. and finally have gotten to the point of where i want to get better at the game. I started watching videos and viewing guides, taking a lot of time in custom games to get the hang on the game and tried out different lanes and characters. I've been doing this non-stop for about 2 months now.
However, the gameplay when it comes to PVP has not shown any progress.
I get ganked easily no matter where i ward. I keep running into games where not only do the players harass new people/inexperienced players, but belittle them to no end. I ask for help or for people to take me into games and SHOW me tips and tricks (not just watching videos, but actively SHOW and TEACH me the ends and outs of the game. I'm a very hands on kind of guy) with no results. The one friend i had who played lost internet, so i am stuck with total pain in the neck people. I get pitted against champions i am bad against, or can't figure out how to beat. My skill never seems to improve...and after countless hours of trying, i am at a loss for words on what else to do.
So i finally saved up and got Jinx, the character i think i would be best at (still have not tried everyone yet) and my games have dropped the last few times, either because of people dropping out, or for running builds to try out and getting harassed till i basically just about gave up (going 2-14-7 against Blitz/Ashe in bot with a so/so support).
I don't know what else to do. Watch my games, try to team work, push lanes, farm under turret; i don't get what i do wrong! And it is annoying to no end how i never seem to get better after countless hours of TRYING to. And i AM trying to. I am a very team-player kind of person, and can't, for the life of me, find teams worth playing with either. IN A TEAM BASED GAME.
...Kinda blowing off steam as well in case you didn't notice.
I just don't know what else to do and would like some advice.