Your builds are decent, not "cookie cutter" or "copy & paste" which means you are paying attention to getting what you need depending on the situation and that's good. The "Pro Builds" are great as they work in 70-80% of the matches you will play in but there are occasions when you have to deviate from the path to either help survive a fed laner/jungler or maybe to give some boost to you or a teammate to help push a lane down or to help save a lane. So keep playing with your builds and find what works best for you according to your play style, not everyone can/does play each champion the exact same way so it's more of a "Try it out and see how it does" type of thing.
For me, I tried the playing only ranked thing for a while and it leads to some bad results most of the time. Here recently I've started doing 6-10 normal drafts and only playing 2 champions at most and tweaking builds/play styles to get comfortable with the champion. In these "Normal" matches go ahead and take some chances and do something you wouldn't normally do in different situations so you can see first hand what the result is going to be by doing it. For example, on occasion when you feel comfy with certain skill shots/abilities against an opponent, once you get them poked down go ahead and make that short chase/turret dive and see if you can pull off the attempt and get out alive, don't worry if you make the dive and get the kill and shoot off through enemy jungle to escape turret aggro only to get caught by the jungler, this can and will happen to the opponent from time to time as well. This game is built around team play and calculated risks, it's impossible to sit in front of your own turret the entire match and win lane or even game. Sooner or later you will have to take a chance and make something happen. Use these normal games to test out ideas and see what you are capable of. Then take this knowledge into ranked play (once you get good at it, not just because you pulled it off once).
Also take whatever role/champion you like to play and play it to death. Every match possible try and call one lane and get your best or 2nd best champion for that lane and play it over and over and over. Over time you will get to play against different champions in your lane of choice and will get to see many different types of play styles come at you. This will better prepare you for ranked games as you will have a much broader sense of what can be done against you and with who and eventually you will also learn how to either stop them from doing it to you or figure out how to turn their strength against them. Patience goes a really long way in League and keeping your emotions in check will serve you better in the long run.
Lastly you can find a program online to record your game play or there are some sites that you can send a request to spectate the game you are currently in and get to see every move made in the entire match. This would give you some insight into what lead up to you being ganked and might give you some ideas on how to prevent it in the future. Just some ideas from someone who is in the crap ranks (but slowly making the climb out of HELL)
Here is a site (although I'm not sure how to register for it... I don't speak whatever language the important stuff is in) that has a replay of some of my games. Scroll down to my teemo game, it was a fun one.
http://na.op.gg/summoner/userName=malrin1981
on 
, she has modest disengage with her E and the spellthief is much better for making her trades hurt more.
