so I just got wrecked as ADC in consecutive games and realized I have no idea what to do when behind
Hi,
I just recently hit level 24. I played co-op versus AI for a few levels off of the start, blind pick until around level 14-15, and have exclusively done draft pick since (outside of first win of the day). I've gained a lot of experience in various roles, but due to my initial champion (Tristana, since she was free from facebook) and lack of people playing ADC anyways I ended up as an ADC main (I'm trying to play Ahri mid as often as I can lately to have a strong second option).
ADC is my bread and butter. Up to level 24, I can honestly say that I never lost lane. Not once. I won lane in about 80% of my games and came out even in the rest. Up until today, when it happened and I had no idea how to react.
I'm going to be fairly thorough on what happened because I know exactly what my first mistake was, but want to identify any subsequent mistakes, and what to do in these scenarios. I figure I learn best in this game by doing, but I don't want to intentionally start losing lane to practice coming back obviously! So this will have to do.
My last two games, I got WRECKED. I played Caitlyn both games (I main Caitlyn and Tristana, Tristana was banned both games). The first, not bad. Something like 0-3, but I had nearly double the CS of anyone else on the map the first time I checked (I was at 83 and the next highest was 47) and still considerably more than anyone else at the end of the game. I thought it was no big deal, not my fault. My support didn't buy a gold income item and kept attacking my minions. I was focusing a lot on telling my support to stop CS'ing and trying to steal cs from my support that I figured that's what caused me to be unable to react appropriately to ganks or to Leona leashing on to me and stunning me to send me 100-0. So I brushed it off, I lost lane but my mistake was worrying about my support when I should worry about myself - I wouldn't make the same mistake, so I tried to play another game.
Big mistake. I'm hoping I tilted, but honestly I doubt it. We were red side, went towards jungle. I went to run in just to put in a deep ward, but the mid and jungle followed me so I figured why not invade? We ran in to their Blitzcrank and dealt some damage, and their Ashe and J4 showed up. We battled 3v3, Blitz grabbed our Vi under his turret, Lux killed Blitz for first blood, turret killed Vi for them, then Lux and I ran and Lux was killed trying to get away. 1 for 2 trade, not good but not terrible. Then we start farming, and since my summoners are both down I get grabbed by Blitz and killed. I had almost 400 gold, not nearly enough for anything helpful, so I just grabbed 5 health pots and a vision ward. I was thinking as I do when I'm ahead though. I buy an early pink ward and throw it in the little bush near dragon and get really early vision of any incoming ganks so I can safely push lane as far as I want, and better yet it typically stays there for a long time (10+ minutes). Again, clearly a big mistake, I run back too lane by the river since I see the minion wave is reset and there's plenty of room to run in behind my minions. As I near the river bush (they must have had a ward in it) Ashe starts moving towards me, hits me with her volley to slow, hits a couple more, Blitz grabs me, knocks me up, I get killed 100-0. I'm suddenly 0/2/1 and still level 1. I grab a second Dorans Blade because that's my normal strategy if I'm forced to back early.
So that's how I got to the position. I'm not planning on letting it happen again. Let's say though it does, what do I do? I'm around level 2 (got it on the next creep) and already 2 levels behind both the ADC and Support. Leona is just hugging tower the whole time and not getting xp, so she's also level 2. We try to wait for minions to come to tower and farm under tower, but without our own minions to hide behind I realized Blitz can grab me so much easier and pull me away from safety (the had way, now 0/3/1). We're in lane level 2 against level 5s, our level 5 mid laner and jungler come down to gank or something but it just pushes them back and resets the minion wave (depriving me of farm once they leave). I wait and CS some more under turret, we're level 3 versus 6 and Ashe lands her ultimate on me under tower fairly easily, Blitz obviously has no problem grabbing me when stunned, and suddenly 0/4/1. I grab a third Dorans. Last a bit long the next time, but we're being zoned ridiculously. I escape the next attack, recall and reluctantly buy a fourth Dorans (at this point I figure the game is lost since our other lanes aren't winning anyways and I have no idea what to do). Ashe and Blitz started roaming to mid, so I finally got some free farm bottom. Took out a few waves, took the turret (was this a mistake?) and eventually got a Phantom Dancer and T1 boots. So I'm sitting on 4x Dorans, PD, T1 boots versus Ashe with T2 boots, Statik Shiv, BF Sword and Pickaxe. At this point I'm trying to stay with my team and farm when I can. I'm targeted and really can't do anything though. Basing constantly, basically given up. We for some reason don't surrender at 20. We surrender at 25.
What could I have done at 0/2? How could I have prevented this?

: 
into an IE and LW

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: 
(If you have to guess, buy these two)
picks one of the three paths, then builds whatever he wants afterwards.
I don't know, I think she's part of the IE-Statikk squad, but I haven't seen her post-ADC itemization rework.
is a good defensive item which gives 80 AD.
. If you don't have an
. If you need more attack speed, buy
(whatever you do, don't own both). I suggest making an item set so you have easier access to all these.