.Apathy can be a terrible thing, because you inevitably not only numb the emotions that come from others, but also your own. Trying to function in daily life as an emotional zombie is a very unpleasent thing, let me tell you.
~:Shin:~
Yup... It is terrible.... I began feeling emotions last year, I was still in 3rd Year High School that time.... I don'r know how to stop feeling/catching these strong emotions and because of that, I am prone to overloading...(I'm not a practitioner back then, I just started this year...) After a while, I started to "ignore" these emotions.... which lead to my present state/problem... I can't feel my on emotions anymore... maybe just a little but not that strong anymore.... I am still an empath because I can still sense emotions passively... (i don't know how to receive emotions aggressively or with my intention to do so...)
Again, my best suggestion is Meditation, Centering and Grounding. Meditation to relax and quiet your mind, Centering to return to that mentally peaceful state whenever you want and need to, and Grounding to release the emotions and energies that you receive from other people and things.
My empathy is still passive, but I'm not as apathetic as I once was, and I certainly don't get overwhelmed as often as I once did.

Might be a bit off topic... but would those that had numbed themselves like this... wouldn't they replace their emotions with psi based feelings? or even in case a construct or possession ... wouldn't something like put someone in this emotional state a real mess? heard sensitive people sometimes do this because they are unable to tolerate the pain of others around them... or they would go insane.
There may be those who could do those things, but Apathy is a psychological issue, and not really a psionic one. So even if an apathetic person learns to shield and to ground and center and all this, they still have the problem of being numb to emotions and maybe even energy, perhaps even to the inevitable extent that by the time they overcome the issue years later they have lost they're original empathy and similar abilities entirely.
It really comes down to a simple matter of learning to let go versus building walls around yourself. I first learned to build up walls, because it was the easier choice. But then as the years rolled on, I found myself socially withdrawn, with no friends or even any hobbies. I was a textbook case for social anxiety, and a number of other things. Then I began to learn to let go, and things have only gotten better ever since. I am still somewhat of a hermit type, but quite happily so.

~:Shin:~