What can be done about wanting to change things in the present that you can't?

I've practiced meditation, and a lot of it seems to be about not dwelling in the past, or waiting for a future which may not arrive as we expect. But what about the present? The deal is relatively trivial or trite; I want someone to say something: apologise. Actually, any sane person would want the same, given the (past) behaviour or this person. All the same, it seems of overwhelming importance whenever I let my thoughts wander. And while it is pretty trivial, when my thoughts do wander in this way, I believe that everything in my life is great just as it is, except this, which is making me want to give up completely. It seems a little wrong to say *just don't think about it*. Is there any other option?