I know it's hard to believe and not what you want to hear, but if you really can "carry really well" then you wouldn't lose so many games. If a good player watched a vod where you are the carry on your team and you lost, they could easily point out what you did wrong and why you lost based solely on your decisions. Of course there are some games where you just simply can't win. If you were given a replay button in a game where you were carrying and you lost, if you replayed it enough times there would eventually be a replay where you won because you did something different that worked. Roaming to bot lane and giving your bot lane two kills can literally win a game.
If you ask a high elo player how to climb the ladder they will simply tell you to get good. Also being able to use your pings effectively is a skill in league of legends just like mechanics and decision making, especially if you're carrying.
If you want a "safe" champion to avoid getting ganked, Ahri has a very low risk playstyle because of her ult, charm, and Q movespeed and also roams very effectively and is a very strong pick in solo queue right now because it is hard to focus a fed Ahri when she's dashing all over the place.