Yeah. At my level, or at least the people I play with, don't like playing a real tank very much. So the enemy dps characters usually just run around and kill me. I did notice the lack of CDR though, so I will be trying out that build.
I used to have to play tank or support almost every single time. Now my rating is high enough that it's only more than half of the time. Gonna be honest, most of my advice is tailored toward my ranking. When I've dipped into Elo hell, my performance drops significantly for a while until I get used to the fact taht teammates don't know what they're doing; at knee-jerk moments I make moves that set up for a guaranteed kill, then my allies just derp around not knowing what to do and I eventually die. Or I will poke-harass while falling back, and my allies will assume I'm trying to initiate a teamfight and all walk in and Self Delete. You quite literally need to change your mindset and automatic reactions as you shift through the Elo in order to maximize your team's win odds, which is a very peculiar situation for a game. So yeah, you might need the tankier build after all; just see how it works.
4v5 = easy mode for the 4.
In a real game with people who actually know how to farm, it's pretty much even until 37:00, at which point the 4-man loses if they haven't basically won yet. I call it the 37-minute rule. At about 37 minutes the 4-man is hitting level 18 and 6 items, while the 5-man is only 80% to their max and equal in power. Once they're 125% the strength of the 4-man, the sheer mathematical advantage more or less obliterates any small advantage in skill you may have despite matchmaking - if you haven't won by 37:00, your skill advantage is necessarily not large. After 37 minutes, I've seen about a 2% win rate with lucky backdoors and suicidally overconfident enemies. Anyway the point is that the 4-man never has an outright advantage, otherwise the pros would incorporate having an AFK as their meta in ranked and tournament play.
Really do hope ... that you're going to get banned asap [for not being good enough at the game].
I never actually disliked you as a person until this. I really hope you're joking. It's stuff like this that makes the community toxic.