Hi there,
My best friend was murdered 16 months ago and I know that it sounds like a cliche, but time does make things easier. Don't get me wrong, it still hurts everyday when I don't get a call or text from her, but I have learned to get on with my life (if for no other reason than to make her proud).
Also, I found that when I came across other people suffering (like the person you referred to) it hit me a whole lot harder.
All I can say is that it's only been 6 months and you have to give yourself time to heal, you are still grieving and that is ok. It might help to speak to someone (although I never did) who is totally neutral about the situation, like a counsellor.
I really do hope things get easier for you, I promise it DOES get better.
All the best