Good for you old boy, although a goal to focus on can have its positives there's always those nasty negatives as well.
Living alone with your cat is one of them, you do realise that two people can live just as cheaply as one don't you, and besides a second salary is a positive that can outweigh the negative of living life like a hermit, so as you can see, you can make a positive out of a negative.
12 years to save enough money for this world cruise dream of yours, have you taken into account that negative word inflation, its not good old boy, not good. It would be much more fun having a fair maiden along for the ride wouldn't it, and besides that she could wash the pots and iron your clothes for you as well, there are more positives to having a good woman around than negatives my little hermit friend.
Good luck to you anyway old boy, its always a positive thing to have a dream.
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