If you are losing lane, and keep dying
**DO. NOT. BUILD. DAMAGE. **
For the love of God, I have seen so many people constantly dying in lane and still building damage thinking it will help but nope they just keep dying. if you have gone 0-2 and still are being hammered on, don't be one of those people who still dies and goes 0-10 by the time team fighting phase starts and all you have in your item slots is one damage item and a boots of speed, or even worse- still have the recipe items for a full item but don't have the money for it because you kept dying without trying to avoid your deaths.
If you are being hammered on, stop what you are doing. If it's against a Yasuo for example, like the Orianna in one of my games today, she kept going for Morello's even after my multiple attempts to get her to rush Zhonya's instead- guess what her score was around the 20 min mark? 0-7. So here's the deal: if you are up against AD, rush armor like Zhonya's if you are a mid laner. Top- rush an iceborn, DMP, frozen heart, etc. Don't freaking go for a black cleaver or morello's, thinking it will help you kill them- you are already way behind, they have the advantage over you. Live to fight another day and save some potential deaths, and help your team in the long run.
It's honestly so simple. If you are losing lane, stay back- farm under turret, ask for help, and most of all- BUILD DEFENSIVE if you keep dying. And do NOT try to 1 v 1, you already died a few times, how do you think you will kill them when they are a few levels up on you already? So swallow your pride, wait for help and build the right way.

+
+
+
or
. Still built
but i want my trinity.
x2
if its AP vs AD mid since the upgrade to zhonyas is 5 more armor not worth and at most
is all you need for mana substain , for Ap vs Ap
, if its really bad then they stop at
/
and build either a
or
. AP brusiers well
and hope to survive laning
and well yada yada so in a way they already build defensive