For me, coding is a form of self-expression. 

It's probably the form I'm most effective at.

Everything I code is arguably owned by the company. 

The company controls what I do with my code [in the past, it seemed I had 
freedom, but it turns out all of that was not really the case--rather, I 
was somehow avoiding the control illicitly (for 4 years)]

The company controls the most effective means of self-expression I have. 

This is unacceptable to me as an individual, therefore I must leav.

I don't know when it will be, but I'm not going to last much longer.

I have nothing but respect for the company--I've just come to realize that
it is time to do something different.