Lolpigs, I thought it was guilt too at the time when I was going through it (4 times!), but now I realise it was sadness. Sadness that it wasn't the magical experience that it should have been. But you're dead right - you do the best with what you have. So many people successfully comp feed for months and it helped me deal with the situation too - I still had bubs on the boob, but then I also knew that they were getting enough from ABM to sustain them when I couldn't