A small fire if left alone can burn a whole building. A small hole of not stitched together can get bigger. A small tear on the paper can create a bigger tear. My point is things shouldn't be left alone to be fixed later. If it's possible to be confronted then and there, then you should take the chance and do it. Leaving it for later on will only make it harder for yourself. No matter how hard and scary it is, you shouldn't back out. Especially because you're doing yourself and other people a favor, so you shouldn't feel bad at all. Instead be proud of what you did because you've done the right thing. You've prevented a future problem for yourself. Saved yourself some trouble.
