Blaze 1 hit kill to player

I got my full set of diamond armor but blazes still get me to one hit by their fireballs, this so hard. I have lost so many diamonds even diamond tools whenever I died and when I go back to pick it up, the items are gone. Minecraft PE is so hard in combat, I wanna quit already because of this blazes and is hard to level up and armor tools despawned quickly. Please fix this, I LOVE MINECRAFT