Does anyone feel like they CANNOT win Ranked games?

My experiences with Ranked.

Last Season I was Silver 2, 24 LP. I didn't play much towards the end of the season but I played many, many norms in preparation for my placement matches. Well, I went 6-4 and got placed Silver 4, which is about where I thought I would be. Well, I got to my promos once, lost and have yet to get above 50 points. In fact, just now I got demoted to Silver 5 because I have been on a 10-game losing streak. The teams I typically play against are filled with former Golds and Plats who are now B1-S3. Now I'm all about learning to play against better players, but my matches are typically very one-sided. I frequently feel like I'm playing against a premade 5s team with LCS-level communication and game sense. And frankly, I'm just getting sick of losing.

Before anyone says, well remain positive, don't flame your teammates, etc., well, I do remain positive. I have yet to receive a ban of any sort for being a jerk. I try my best to ping, congratulate teammates and all that stuff. I do my part to ward, I try not to surrender and try to pick champions that will help the team, not just my score.

I know that losing is part of the game, but when you begin to feel like you CANNOT win in ranked, it almost begs the question why do I even play anymore. To echo a similar thought I saw in another thread, I'm considering playing another game where I can feel like I'm actually good at the game. And it is such a shame that I feel that way, because I love this game so much. Riot, please don't see this as a reflection of the game, but maybe a reflection of your hidden MMR and placement system. Everyone wants to feel like they are good at the game they love. And at the end of the day a 9.0 KDA is great, but when you get demoted after a game like that, you just feel like quitting.

This probably seems like complaining, and maybe a little of it is, but I just posted this here because I am sure there is someone out there who feels the same way I do, and I want them to know that they are not alone.

And if at the end of the day I'm supposed to be in Bronze, then so be it. But it would be nice to pick up ONE win on my way down there.