If you're winning your lane most of the time, then you need to start looking at how to actually use the advantage you've gained to win.
You need to use your strength to get your entire team gold, and prevent the enemy team from getting money. Kill/force the other guy back, shove, roam. Don't miss TP opportunities, force Dragon fights, take free Dragons, etc. If you get ahead you need to shit on the enemy team constantly. Never let up and they'll never even get a foot in the door.
And above all be efficient. Don't try to walk from top to mid when a gank is happening mid. You're not getting there for at least 10 seconds. Shove your wave in and get some tower damage. There's always something to do, so if you're wandering around not knowing what to do, farm nearby jungle camps, etc.
Also - When you have money buy wards. 90g after buying your item? Wait for a pink. 69g after buying an item? Wait for a green. 78g after buying an item? Buy a green. 170g after buying an item? Buy two wards. You placing a wards in their jungle saves your life and potentially a teammate's, and increases your overall map vision. If your team sees everything but the other team doesn't, they're eventually going to walk into an ambush/get picked. Don't spend all of your money on wards, but you should try to intermittently assist with vision.
Just remember you aren't trying to carry by yourself unless necessary, you're trying to give your team the gold and experience advantage to carry themselves.