Will you choose your next thought? No! To do that would be as Sam Harris says, “To think of it before you thought of it.” Your thoughts are a string of reactions. Your mind leads you to one thought and then to another. If a watermelon pops into your head, you don’t get to say, “But see! I chose to think of watermelon!” You didn’t choose for a watermelon to pop into your head, it just did!
Some think that conscious contemplation is a process you do control. When you picture the options in your mind, which one to act upon is your choice they say. I disagree, because you’ll act upon whichever choice your brain likes the most. Do you ‘choose’ how much you happen to be inclined to pick one choice over another?
When presented with choice A or B, which one you eventually land on—even after consciously contemplating which choice you want to make—is the will of your condition. You do not choose whether you want A or B, but you will act upon whichever outcome—positive or negative for the self—your neurophysiology happens to prefer.
You do not choose what you want, and what you want will dictate your next choice. A failure to recognize this in your own experience does not negate the reality of the system. The idea of free will may have meaning in a court of law or in casual conversation found in day to day life, but it is meaningless when viewed deterministically.