Your reasons for getting out of politics approximate mine. I was only a town councilman but at the end of my only term, I was absolutely disgusted with both sides, although I fulfilled every single one of my campaign pledges (an achievement most elected officials are never able to accomplish). I always put the Town first and by that I differ from most because I did that to the best of my ability in a literal sense while most will only operate within the constraints or desires of their party.
In so doing I completely alienated my own political party big shots although my constituents were behind me. Every elected official states they do the same thing but they conveniently leave off the, "...as long as the party approves."