Dear Distressed,
I am thinking about you and hope you feel a bit better soon.
I believe the emotional stress of growing up in a family with any kind of abuse can really take its toll by the time we reach this age. (It really started to affect me when I turned 30).
Keep true to yourself. I hope you will continue seeking out ways to study acting and immerse yourself in it in any way you can.
I hope there will be some way for you to find someone you can confide in. If you were here in the States, I would recommend seeing a therapist to talk with. Is there any type of professional there who could help in this way? You deserve to be able to talk to someone about this...
Additionally, you might want to see a doctor to rule out any physical illness or deficiencies. I myself had mononucleosis twice: awful feelings of lethargy. On the other hand, symptoms of depression include a loss of energy as well.
Please be gentle with yourself.
Sending many supportive thoughts your way...

Elana