(A few other people here may, actually, also know something about FETs. But even if you don't, read on, because you'll understand this analogy, I'm sure).
Most people in the world can be thought of as Gates, Sources, or Drains.
Sadly, the vast majority of that 'most' are "Drains". They
always soak up effort and positivity, and give nothing back. Nothing much is left behind to show that they've swalllowed-up all your work. There's no reciprocation, no reflection, no true communication. It's gone, sucked away, and you're doomed to be dragged down by their sheer negativity. Keep a safe distance ...especially when surrounded by lots of them.
The next small minority are Gates. They tend to be usually neutral in their dealings with others, but they're sometimes able to be channellers/facilitators/enablers. The best ones do it well, and often. They're either rare people who used to be Drains, that've made a change, or (more often) it's just been their way since birth.
The very rarest people of all are Sources. Of fun, ideas, capability, direction, energy. They are extremely rare, because, like stars in the sky, they need to be shining when you're looking at them, there when you're looking for them, and not washed-out by either clouds or sun. Unlike superficially-popular people (most of whom.are Drains, or rarely Gates) they are genuine to the core, and deliver lots....sometimes to their own personal cost.
If you feel there's bias in this analogy, you should try to resist such thoughts. It'll be to your gain (and if you've understood my schematic here, it shows we share some common connections)