Copy pasting what I told someone else
At first I thought you were a troll so I played along. However based on your response and after doing a little research I found out you're truly genuine.
It says here you're Bronze 3. First let me say that I started playing this game at Bronze 5 and last season I could've grinded to Platinum if I didn't wait until last minute to play Ranked.
It seems that your main problem is lack of experience. I'm not going to be mean to you and call you a retard and explain to you why you're wrong, because you wouldn't understand. Instead I'm going to try and help you. I remember how difficult bronze was and to this day I still say that you're not "good" if you didn't carry yourself out of that hell hole.
My first advice is to start watching live streams of LoL being played at a professional and competitive level. This will help provide insight on how the game is played at the highest level. Go to twitch.tv and find a streamer you're comfortable watching and plays your favorite role.
Watch YouTube videos that include advanced tips like how to last hit more efficiently, vision control, etc. it seems like you prefer top lane, which is one of the most difficult lanes.
You're in Bronze because you haven't mastered the basic mechanics of the game like last hitting, warding, zoning, etc. Don't be hard headed and say "man I know all of that". Take your time. Play a custom game. Look up pro player masteries and rune pages. Watch live commentaries to better understand what's going on in a match.
Don't focus so much on killing your opponent, but on dying the least on your team. I guarantee that if you never die and take risks, you'll at least make it to Silver.
Finally, master a champion that's mechanically intensive and easy to use at the same time like Draven, or Teemo. Make sure you use smart casting and practice attack move for ranged champions (shift+right click).
Hope that helps!