Missing Chances

Do you ever feel like maybe you missed your chance? I suppose in a way if you trust in God and in his infinite plan for your life it's hard to say that you missed a chance because He knows what is going to happen and plans it all out, but does God give you choices in his plan?
Someone brought that to my attention the other day. She said that she believes that God gives you choices on what to do, that sometimes he doesn't always just make it clearly apparent what direction to go in (really ya think?). So that got me thinking in terms of my relationships and I suppose lately I've been a little frustrated with the dating scene, being that it is non-existant for me, and I wonder...did I miss my chance?
Did I let go of the wrong person? Is that possible in all actuality? I'd like to think that God will in fact make it impossible to let go of the right person permanently, but I guess I never thought of the prospect that I might actually have to do something in order for it to all be right again. Maybe God won't just magically fix it, but I know I can't push something that isn't there.
I've been wrestling with this for over a week now, actually more like two. It's really annoying because I still don't know what to do....take a small bit of action or just stand idly by and wait for God.
I think I do know my answer, but I want to be sure.
So action?
Or wait?
hm.