why do i suck with literally every champ i play with?

i play top and basically no matter what i play id say i get outplayed 8/10 matches and those 2 are because the enemy is really really really bad.

i started maining fiora because i liked how she can split push but sometimes i get tired of her and start playing other VERY EASY champs and even with those i end up feeding the enemy and most of the time i just cant understand why. i usually play flex with 2 or 4 other friends who are way better than me btw (around gold level)

here is my op gg in case its needed for context https://www.op.gg/summoners/euw/Drixus-4244