Hey, don't be scared of playing ranked! Yes, there are a couple vocal jerks out there, but a lot of people (in my experience) just keep quiet and try to win. Like a guy mentioned earlier, just pick up a couple champions that you enjoy playing and spam them in normals until you've played every meta matchup in your lane with them.
I just started ranked early this season and went 2 wins 8 losses in my placements; got placed Bronze II. Played them all as support (would not recommend). Bronze ADCs do not appreciate bard support (which happened to be the one champion I decided to stick to). Still, I'm currently Gold I with I think 40ish LP and 85% of my games as bard support. While it's nice counterpicking the enemy or picking to fit a certain team comp, in the end, your skill on that champion is gonna matter much more than either of those.
If you ever want to practice some champions in normals, hit me up. I love helping out another one-trick :3
Also, check out my friend's discord group "Momentum Gaming". We're not the best gamers, nor the most attractive, but we have women and cookies a lot of fun and usually some people playing normals/ranked throughout the day. Great place to make new friends! Here is the boards post if you want to check us out (discord link is in the post): http://boards.na.leagueoflegends.com/en/c/team-recruitment/qYVxNiM4-momentum-gamingc-theres-a-method-to-our-madness