You should probably bring this up sooner rather than later. The longer you leave it the harder it'll be. Maybe something about loving them as a person but no longer being attracted to them on a sexual level.
There's not really any way I can think of that won't hurt at least a little bit.
I hope you can get to the point where you no longer give a crap about those people and find a way to live for yourself or someone you actually care about.
That said, spite living is still better than not living at all. I wish you a chance at a happier life.