Let me start off by saying that last season I ended in Gold 1. I did my placement matches immediately and I was playing against platinum, and sometimes even had a diamond or two on my team. I got placed into Gold 5, which I wasn't upset about, but wasn't really excited about either. I remember being stuck in Gold 5 for a very long time, and then after I got out it all just flew by. Now it's quite the opposite.
I went through about 5 promos to get in to Gold 4, and I lost them all due to feeders, everyone losing lane, or people just afking. I know you're all probably thinking it's just bad luck, or I'm not good enough to carry, but trust me, you CANNOT carry a team by yourself when the entire other team is fed. At least I can't. So I believe on my 6th promo I breezed through and I finally landed in Gold 4.
Now being in Gold 4, I expected to be in promo quite quickly, and I was. I got destroyed in promo, and then lost practically every game and got demoted to Gold 5. Now, I'm going to spare the rest of the details to make it short but I've been in and out of Gold 5 / Gold 4 about 3-5 times now. I play with platinum players in Gold 5, and then I get people in Silver 2 when I'm in Gold 4 and I practically lose every game and I just get demoted. I usually get a good team every 1 in 4 games I play.
So now I basically just want to uninstall because I CBA to make a smurf after spending a ton of money on skins / champions and investing my time into this account, but my MMR is completely ruined and I feel like I'm going to be stuck doing this forever. I think the reason this happened was because I duo'd with someone in Silver 1, and basically tanked my MMR to what it is now, but I'd rather not blame him because in the end it really is my fault.
TLDR, my MMR is awful and I've been demoted from Gold 4 to Gold 5 multiple times, and my MMR is completely shit. What do I do?
Edit: I do watch gbay99's videos about mentality and I check out trick2g's live streams a lot and I have learned more about the game from those two than anything really.