PSA: You win a lane hard by zoning when ahead, not by going all in over
This essay is listed in my "Master List of Essay Threads" under the title "On Zoning When Ahead"
If you have a lead in lane against an enemy who outscales you, the way you win is to pull the minion wave close to your tower and freeze it, then position yourself to all in the enemy any time they come to get a cs. They will either back off and fall sooo far behind in xp and gold that they will become worthless midgame and you can end before they get a chance to catch up and scale or they will get greedy and try to cs anyway (at which point you all in them and either get a kill or force them to b) or they will fight you (and lose) or they will call the jungler and try to 2v1 you right in front of your own turret which should be heavily in your favor to live and escape.
The way to throw a lead is to chase the enemy to their tower trying to kill them over and over, because even if you don't die stupidly diving or getting ganked, you'll push the lane and they will be able to close the gap in gold and xp safely under their turret.
in low elo