Step 1- Don't go in without support (crazy concept haha)
Step 2- If ahead and the support goes in ( gets a good stun or hook, or what have you), you should put farming on the back burner and get a double kill instead.
Step 3- If behind, stop fighting and farm under turret (Don't say you don't, as a support main it happens far more often than just getting tower dove).
Step 4- Recognize you are not Doublelift, Don't 1v2, or 1v3, or 1v4, or 1v5.
Step 5- Revisit Step 1.
Step 6- Buying a defensive item and not getting 0-100 is better than losing a little dmg.
Step 7- Stay in the back. I see alot of ADCs get too excited and push passed their front line to hit 1-3 autos, then end up taking 2-5 ults, then blame everyone for not peeling.
Step 8- Have fun. If you are too tense, every little mistake will tilt you. Yes, be aware of the mistakes you make, then fix them with a smile as you outplay the enemy who expects you to make the same mistake over again.