Stress
There are two (non-relationship-related) stresses in the life of the sculptor. The first are the physical stresses. Expect to work for long hours, often in very repetitive motions. You'll also occasionally be in incredibly cramped and uncomfortable positions. Physical exercise is very important to keep yourself loose and limber in order to complete your work.
The second stress comes from the ability to turn your art into a viable career. For this to work as a job, you have to be able to turn your sculptures into cash. From commissions to stock sales to gallery shows, your work is your lifeline only if you can get people to pay you for it. This can often mean adjusting what you do to fit the needs of your client.
So in a way, you'll have to sculpt your own reputation as if it were an impressive statue. The question is, will it be built out of steel and iron, or something softer like, say, butter? The one you pick may not be clear to you now, but if you're able to do this career for twenty years and still come out on top, you'll know which one you chose.