Although it would be nice if they did something like, "lose less LP when team surrenders and you dont", it is a team game, and thus if your team surrenders, you go down with the ship. You didn't destroy their nexus, and your nexus has been surrendered.
I mean, that is honestly just life. If you are at a job, say like a large factory, and the company sells out or goes under, you don't get to keep your job even though you were against the sell out, if that makes sense.
Get better at the game, and snowball an early lead. Especially in low ELO, this is the easiest way to win. When you get a big lead and influence the whole map with it, your team feels empowered and the enemy gives up. I feel ya, I have lost a TON of very winnable games because people just give up. Keep improving, and you will climb.