Why you often die without killing anyone

Tanitha: I think there is a bit more to it, so id add a bit for your pondering..
I think I often don't get a kill because I'm a aggressive front liner tank/player.
So game starts, and I'm often the first player shooting and getting shot, often from long range.
So i find a target, shoot him down 30% then he disapears and retreats.
I find another target, shoot him down 30% then he disapears and retreats.
Arti finds me and smashes me for 30%
I find a target, shoot him down 30% then he disappears and retreats.
I find another target, shoot him down 30% then he disappears and retreats.
I dogfight a tank, take 50% off him, lose another 30% myself, so I'm getting a bit weak and I withdraw and take a more minor role of sniping.
So I'm down to 40% now.
I get into a unwanted dogfight with a tank i take 40% off them, they finish the remaining 40% off me, and I am dead.
So I've done 210% damage to tanks combined, and died, but got no kills.
Every tank I faced, was on 100% health.
So now the more cautious players, who have been camping for the first 1/4 of the game (Or the slower tanks), will come along and finish off those 6 damaged tanks, who have smashed tracks, damaged engines and turrets, who can barely move or shoot.
I don't mind the above, I like my "front line" play style, if I didn't like that play style, I wouldn't play like that.
I'm doing ok stat wise, 296 games in that tank, 330 killed, 214 deaths. Average exp 621, best game 9 kills.
Just saying the "second line" & more defensive players, or slower tanks, quite often are left with "mop up" duty..
Regards
Tan..