Free will is not the ability to do what you want, it's the ability to tell everyone and everything to fuck off, society, nature, laws, so on and so forth. What separates humans from other animals? It's not imagination or intelligence, lets face it we have trained circus animals that can perform the functions of some of the most influential people in our society. No, it's our free will, our ability to circumvent natures plan. Let's look at that plan for a moment, the basics of every living creature, to eat, survive and perpetuate your genes, the same goes with plants. That's it in a nutshell, now humans have gone around this, we eat and drink things that will kill us, we commit violent suicides, some of us even take vows to abstain from sex their entire lives. Those are just a few rudimentary examples of free will, I won't go into any further depth with this, you can figure the rest out for yourself if you want, that’s your free will