Of these groups the one I have always had the most problems with has been myself. Generating genuine compassion towards myself seems to be very difficult. I have spoken with quite a few folks around this and my experience is not uncommon.
I can be really quick to see the less than perfect aspects of myself. My self judgment can be so much harsher than I would ever judge others. If I spoke to others how I internally speak to myself I think I would be friendless very quickly.
And when it comes to my historical judgment and attitudes towards my body, well it really has not been skilful.
So I have been starting to try to develop a practice of love and patience towards myself, to treat myself with the same (if not better) level of compassion that I would others. I'm actively practising in meditation and Yoga and dropping into it throughout the day when I remember.
It's a work in progress but something that I feel is essential. How can I really offer compassion or love to others if I can't offer it to myself.