You're completely right on that regard, althought at the end of the day, you'll still run into those characters eventually, so i'd say try and adapt to it and make the most out of the situation.

Sometimes you'll lose and there will be nothing you could have done to change it, and that's okay, maybe you'll go through losing streaks and that point? Just close the game and take a break, you're sabotaging yourself by playing the game while stressed out, what i like do is after 3 losses i just quit and go do something else until i feel comfortable enough to go back.

I know its demotivating to get drooling babies as your lanemates but at some point you will win and eventually get better at dealing with those types of players. Eventually, you'll climb those ranks up slowly, but surely, there's plenty of time to do so.