I really need some help.

Lately I've been wanting to learn different roles since I played nothing but the AD Carry role last season and learned every ad carry champ in the game besides Ezreal and Draven since I hate those two champs. I was told by a lot of other players that i should learn a different role like top lane since I'm a good adc. In my opinion I think I'm garbage because I'm passive and I focus on farming till i get my first item then I roam around the map searching my objectives and kills but early in the game when I have an opportunity to get a kill I don't get it since my support steals it from me and I cant do anything for the rest of the game. I don't flame anyone and I usually know what to do but lately I haven't been able to farm correctly and my top lane feeds and the game is over in 20 - 25 minutes since I ff and I feel like I cant anything to help my team. I feel like I've gotten worse in the game and I wanted to take a break but they're a lot of other lanes i haven't learned. I'm not ranked and I only attempted my first placement match but that didn't go so well. Is there anything I should do? Check out my match history if u want to.