Sorry Bid, but I'm siding with the violent violet
I know exactly what you mean Sarah. I'm Will, 37, late diagnosed Asperger. So I've also had a lot of years of the world being a nasty place before I understood why.
I understand what bid is saying, although my interpretation might sound a bit cynical. Lie. That's it. My guide to surviving the human race - smile sweet and lie Birthday cards, periods of mourning, "darling, I love you more than life itself!"...I don't feel a bit of it. Because I am what you describe as an android. On Monday I can love, bury, or any other moment you can imagine. But next morning it'll be just another Tuesday.
My point is, fake it. As long as you smile sweet and pretend you're like them, they leave you in peace.
Meanwhile think about an old Greek idea. Three kinds of love - Eros, Philios, and Agape. Eros - sexual. Philios - family and close friends. Agape - the human race. Think through the three - decide for yourself if you have loved or can love or want to. Because that seems to be what you're talking about - what feels important enough to care about - yes?
I already went through that whole line of thought, but I won't tell my conclusion in case I spoil the surprise