"Identity" - Let us define it as material, biological "code" which determines who you are, that is determines shape and structure of your brain, the way you think, the way you process sensations. Your identity is your DNA at the start of your life, and as you live, this code, now reflected in the patterns of your brain, combines your memories and your thoughts to change and update itself, producing slightly different patterns and thus representing slightly older you, but also your newer and hopefully wiser identity or personality. By "brain patterns" I mean whole spatial and temporal description of every atom/molecule and charge in your whole nervous system.
Now, suppose exactly to nanosecond on my 20th birthday I get to choose between a cup of tea, coffee or milk, and patterns in my brain representing this choice at that time look like this:
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|vvv||vv^||^v^|
tea cof mil
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|vvv||^^^||---|
tea cof mil
The mechanism: as I make my choice, say charge randomly fills in my choice receptors and whichever one reaches its threshold first marks the choice has been made. The choice was made by me, by "patterns of my brain". Is this not free will? And if not, then what exactly is it I am not free from, in this case?