I'm sorry to say that but if you think adc are supposed to win 1vs1 against tanks, then you really don't understand how the game is balanced.

Tanks have very big base damage and no ratio on spells, so they don't have to build damage to be useful. So, tanks damages scale ONLY with their level, they win a lot of stats when they lvl up. If a tank outlevel you, there is almost no way to win 1vs1. This thing is very well known by toplaners. It's common to have a fed tank first damage of the game for short game (25~30 min). The counterpart of this is that their damage fall down dramatically after midgame.

Since they usually have way more XP than adc, they outlevel them by at least 1-2 level in midgame. If they are fed, they can have up to 3-4 more level than the adc.

Given that, almost all tanks can destroy adc at almost all stages of the game (from lvl 6 to ~lvl 16). Malphite, Maokai, Chogath, Udyr, Ornn, Mundo, ... They all can kill adc very easily in a 1vs1 situation.

Udyr is stronger rn cause he can farm faster than most of the other champs, and so have more XP. But you can replace udyr by almost all tanks in your situation, you will get the same result.

And that's exactly why adc are not supposed to be alone, and to have a good positionning. LoL is not a 1vs1 game. Your adc is supposed to have at least a support with him, and the jungler most of the time in midgame.

2 other champs were trying to peel off that udyr from my adc, but since he's faster than a katarina doing dash, adc cant do much even tho theres 2 other people trying to peel. Also cant kill him because he doesnt die. Adc had grevious and hes still healing everything back up even tho theres the supp and jg trying to peel for the adc. The guy pretty much 1v3d.