How to not feed/die and improve in lol

Hello, I have been trying to improve my game. And my game plan is to not "feed" or die, as a starting point to become a better player. Even if i suck, bieng able to not die is a good start i think. But it seems impossible to me. I always end up with a few deaths. Its even harder in games where my team is in a loosing position. And sometimes the enemy team uses teamwork to jump onto me and kill me fast. My problem is that I find myself very passive and "loose out" on experience points/levels and gold. And most games i do end up with 3-4 deaths. So how do you keep that 0 deaths and keep up with levels and gold?
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