Is it just me?
Life Force isn’t health, it’s that extra green bar you get to use for your F1 skill Death Shroud. Also, the few skills besides your actual heal (Consume Conditions, Blood Fiend, Well of Blood, etc) that do give you extra healing tend to return relatively small amounts of health.
What you typically do as a necro (non-minion) is to get into combat, lay some conditions or build stacks of vulnerability while accumulating Life Force, heal if you’re low on health, then pop into Death Shroud and spend your Life Force as both a health shield and to power your other DS-specific abilities to as extra damage and utility. Then pop out of Death Shroud and repeat.
You’re mostly not going to do incredible damage as a Necromancer (with some exceptions), but you’re one of the most innately resilient classes on the field, especially when specced and gear for it.
the necro is a tough first class. try making them into a support class and focus on living as long as you can those are the necro’s specialties. for example at level41 i have 8.4k health. that’s nuts.