It must be me but what am I doing wrong as adc?

It just feels over the last couple of years I can no longer adc at all. Back in season 2 I had no idea how to play the game but of course was confused why I was bronze (because no one believes they are bronze).In season 3 when the new ranked system was introduced (leagues and divisions not just elo#) apparently my elo was equivalent to bronze 4 because that is where I was placed. I was angry. I was basically as low as you can go in rank so I knew I had to rank up quickly. I ranked up fairly quickly maining as adc. I look back now at my stats and realize they are pretty bad, but I guess they were good enough to get me into silver. Then in season 4 I played a lot of adc. A lot of . I only got as high as silver 2 but I felt ok about playing adc.

Then in season 5 I just lost it. It seemed like I could never win a game. I had lost any confidence I once had as and . I still played corki but my favorite adc was . Granted this was before her rework and people did not see her as strong so I would get a lot of shit for picking her in ranked. I have never been good at or so I made the decision to stop playing adc last season. I started focusing on my support and after a long battle I finally got into gold.

I know I am a low elo player but I feel I should be able to play all roles around gold 4 or 5 level. I have played this game a long time, have all the champions, a diverse pool and lots of low elo experience. But for whatever reason I just can't seem to win as adc anymore. I feel like I can compete in lane vs other adcs but by the end of the game the enemy team just always gets to me and I am dead before the fight really starts. Meanwhile the other adc just sits around behind or even all game but by the end my team never gets to them and they end up killing my team and winning the game

I know none of this really matters since I do not have to play adc (especially with new queue) if I want to continue to try and rank up. Truth is though I really like the role and miss playing it even if just for fun.