I don’t necessarily think that “few will be saved,” is quite as binding and specific as you are indicating. I would agree that it’s a very good warning for us, who often should put more effort into doing God’s will than we actually do, but I don’t agree with the idea that “few” as meaning a small part of humanity will be saved. It’s certainly possible, but as another poster brought up earlier, as God’s will is for all of humanity to be reunited with Him, even one person in Hell is too many, and all but one person in Heaven is too few. If few are saved, it is because there are few who ask for God’s forgiveness. Rejecting God’s mercy is how one’s soul is in Hell. God offers us mercy, but so many do not accept because they do not know that they can.
One can see this kind of thinking in many situations. It’s a very human way of viewing guilt and responsibility. If you were to back into someone’s car while leaving your driveway, say you even total their car, and they forgive you, reassure you that their insurance will cover it, it was an old car, they aren’t really mad at you, they understand it was only an accident and it will be taken care of, it does not make it easy to forgive yourself for that. Particularly when someone is so gracious about it, as we generally tend to prepare for the worst possible outcome, our own guilt and disappointment with ourselves can even be greater than if the person were to be livid and demand reparation.
Likewise regarding God, we often, even unintentionally, sin against Him. To someone who recognizes what sin is on a more personal level with God, that sin is even more serious to them. They understand the severity of their sins in regards to their relationship with God. And yet, all we need to do to receive forgiveness for our sins is essentially say “God, I’m so sorry,” and mean it. He isn’t angry that we messed up, but rather overjoyed that we want to return to Him, and He welcomes us back with open arms. And, frankly, that degree of mercy and love is inconceivable to us. As humans, we tend to feel as though we did something wrong, and now we deserve for God to punish us and enact His justice upon us.
Just look at the parable of the Prodigal Son. He comes back with full intention of begging his father to just let him work as the lowest slave, and his father throws him a giant feast. That is God’s mercy towards those who ask for it.