getting stomped

i am just wondering how come i am getting stomped every single game lately. i demoted from silver 2 to silver 4 in 1 big losing streak of around 15 games. i realy dont get it. the games that i think yes i am winning this, someone goes afk or we started with someone afk and we need to remake, but when we dont remake someone is feeding there ass off. and i am there in lane with a normal 2/1 and mid is standing 0/8. i know that sometimes you have bad luck. but this is insane. i dont even know when the last time was i had fun. like a game yesterday. i was top. mid got stomped. we had orianna they had lulu. dont know how he got stomped, dont ask me. but then they all went mid and starting pushing. so i went mid. but nobody else. bot stayed bot and the jungler stayed in his jungle. mid kept going in and dieing. they had an inhib at 14 min in. this is a good example of games i get put in. and i realy dont understand why i get this everytime. i try pinging and saying in chat come help. but it's like i am playing with freaking bots. my friends have the same issue. 1 even already uninstalled. can someone please explain to me how this can happen. cause i dont even wanna play anymore. i cant even do anything cause even if i win lane. some other lane had fed the enemy to a 10/0 score. so i hope someone can help me explain or atleast give me some tips. thanks for reading.