Are you too focused on trying to carry your team that you forget to work with them? You don't have to carry alone dude, it's a team game and it feels great to win as a team than to solo carry.
Oh, I see, you main mid. You're focused on killing the enemy team. Yeah, I suggest playing other roles as practice to understand different roles beyond the surface and learn other mechanics and strategies that midlaners don't really practice or have the opportunity to.
Also, in your latest game as Annie, you put down 4 wards in 30+ minutes. That's... terrible. If you want to get better at this game, you need to look beyond the KDA. You are not pretty decent if you do not have good warding habits, especially if you want to climb higher elos where people ward. Buy wards, get pinks, all that crap.
If by any chance you're not going to ignore my advice, I present some tips so you can improve and climb:
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Play support to get better warding habits and map awareness. I'm not suggesting this because it's the support's job to ward (it's not, it's everyone's job), I'm suggesting it because sightstone replenishes and it's easier than remembering to buy wards all the time. It's good practice, and you learn how to lane with someone and communicate and cooperate with both your adc and the jungler for objective control. It's also great for learning how to play defensive as well as offensively with certain kits (Hint: Don't spam Leona or Blitz, play Braum and Soraka as well. It helps).
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Play jungler to reinforce map awareness, timing, objective control, and global pressure. Also really helps with teamfighting.
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Play adc to learn how to be a little more team and positioning reliant. Learning how to rely on others, and to return the favor, is a valuable skill. Of course, you can't rely on everybody, so make sure to use good judgement and find that one guy in the game who makes the plays or whatever. And stand behind the tank.
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Upgrade your trinket at level 9. If you need to finish an important item, it's okay to delay the upgrade. Otherwise, 20 extra AP just isn't worth skimping out on vision.
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Get sightstone, or at least buy wards. I see your "support" Annie game where you set down 8 wards in 37 minutes. The enemy team set down more than double your team's wards, it's not a surprise at all you lost that one.
As a final note, you're too focused on solo carrying than helping your team. Your vision control is abysmal. Vision is an important part of the game, just as important as KDA can be especially in higher elos, so if you want to be a decent player you need to learn how to ward.