Two flawed premises: 1. You're not making a separation between immediate emotions and cognitive emotions. Yes we generally react to immediate felt pain or pleasure, but the high-end emotions, like love or anger, seem to require cognitive evaluation. Additionally, the reaction to immediate pain can and is changed by training, which is why boxers can keep boxing. 2. For free will to be free doesn't mean it has to be "free" of reality. What if free will is a skill, meaning the more you learn how to exercise it the more you do? This would seem to follow the pathway of maturity that we get more control as we mature, but at certain point it's up to us to expand it or not.
Normally I would've answered in far more depth, but alas I don't have that much time today.
Edit:
Cognitive therapy operates on the exact opposite notion (and the one that conforms to the common sense "sense" that we have free will), which is that "love" is a thought not just a chemical, but not to say it's not chemically based. This would suggest that "free will" is bounded and is ongoing circular process: chemical changes thought, thought changes chemical, etc.
We are not free from perception; those who are free from perception are having hallucinations, which is not free will, it's insanity. We are free at the conceptual level, not the perception level, and then can act or not act upon those thoughts. I assume you've been taught your whole life the opposite of you example; namely that stealing is wrong. Yet you're able to imagine the alternative so why would you think someone taught the contrary couldn't? It doesn't mean they would, but they could. Going back to my earlier statement, think of free will as a skill, which sadly means many will never become skillful at it. Meaning in general we would expect those exposed to less would have less means to practice the use of their free will, but they always have it. In other words, since we're free at the conceptual level the more ability we have to conceptualize the more we can exercise our free will.
Edit 2;
By accident I came across, while I was eating lunch, the second source I list below. It doesn't address the main debate here, but it does illuminate the notion I expressed here of free will being a skill