I am not having fun
Lately I lose almost every match because the other team has a great early game and then they just start blowing us up with a mere glance. They play champs like
Etc. and we can't ban all of them or predict which ones they'll chose.
I feel like I can't kill them early game because they are powerful pretty much all the time.
I suck at ganking because there's always a shitload of wards so the enemy laner runs under the tower until I leave.
I can't go anywhere because the enemy team roams constantly and I haven't got the ability to ward everything.
I don't want to play the "strong" champs because they simply don't interest me, or I don't want to play them on the principle of not being a dick because some seem broken to me.
I own

I tend not to want to play the same champ over and over because I have a bad match or lose interest.
I can't chase because my opponent is faster, has slows/stuns, lots of mobility, or they're running into their team that actually has map awareness.
I'm having almost no fun playing. My teammates quite frequently seem to be having the same results.
Should I try a particular champion? Should I do something different?