I suppose it's a fear of commiting myself, a fear of boredom, of monotony, a fear of 40-hour workweeks, a fear of becoming a cog in the system.
But more than that, it's a fear of part-time. Because free time is already so precious to me, because I value my Saturday afternoons and my Wednesday evenings.
I don't want to work. I'm afraid that I won't like it. I probably won't, but that's the only way to make money.