Few suggestions outside of watching streams:
- Go for marginal gains over kills and legendary
In bot it's almost essential that you should be getting last hits on minions and fight enemy champions just to harass. Yes defend yourself, but make sure you're prioritizing mana and effort on minions in a manner which you can retreat safely to your tower. This means you shouldn't be pushing hard or initiating fights unless the conditions are right for a jungle gank.
Learn the essential roles in normal games: Ad range, support, jungle, solo top, and mid
It's like this in low elo, people want mid and top like their lives are depended on them getting it. They'll be last pick and call it with a sense of entitlement, no more like a kid calling shotgun. In these cases all you can do is reason with them and be prepared to play any basic role. This will not only expand your horizons as a player, but it tests how well you can handle that troll lux mid autolock.
People who are uncooperative:
They're apart of the game when you play with random people. All you can do is have a good attitude and try to pick a champion which compensates for the bads.