I often find it hard to reach double digit deaths in ARAM... You're consistently dying more than 10 times when it's completely avoidable.
Don't stick around anywhere with low health trying to "outplay" your opponent.
You're also failing to farm well, even on characters that are supremely easy to farm with. It's a little bit more forgivable on someone like Fizz who tends to eat a lot of harassment, but on anivia? You should be farming at least 200 CS by 24 minutes. You don't even have to try to do it! Press R on the wave, then Q. Collect 120 gold for free. 12.67 minions come down the lane per minute. You should try to get at least 10 of them.
Aggression isn't necessarily bad, but going 1 for 1 every time you get a kill is not necessarily worth it. It completely throws off the balance of the game ridiculously so things that are balanced feel broken because they're getting uneven bursts of gold.