If you are asking for some tips, and it seems you are, I will offer some.
Buy armour. All his attacks are physical damage. Force him to buy Armour Pen items, which detracts from his damage items.
Buy thornmail as well. This reflects damage back to him on the scale that he deals it to you. But now he needs MR to survive it. Detracts from his ability to buy armour pen items AND AD items.
Take ignite or exhaust.
If you see him on full fury, he's ready to attack. Keep some distance while laning. If he closes the gap, exhaust him, damage or slow him, and move back again.
If you are in a fight where you would win except for the forsaken ult, as soon as you hear that scream, wait one second and ignite him. Then escape and secure the kill.
Use your crowd control on him. "but then I let the rest of his team attack me!!"
Are you gonna use it anyway? Of course you are. Are you gonna make the best advantage you can with it? Yes. If that means always use it on Tryn, you're performing the best you can with it. You will get him mad, to be sure. He'll play bad.
Sure, use everything else you have against their next strongest champion (or their weakest, for the kill). Just keep Tryn out of the fight as long as possible.
This is the easy stuff. You'll learn more over time.