Turbotax asks if I, a dependent college student, "supported myself." Most of my support was from my parents, but my income helped as well. So how should I answer?

The total support includes all basic necessities such as food, housing, clothing, and transportation. If you paid more than half of the total costs to support yourself, then you would answer "yes" to the question, and also your parents would not be able to claim you as a dependent.

Here's some information you may find helpful: What does "financially support another person" mean?