Like Capt152 there, I couldn't even bear the thought of being a Flight Instructor when I began training...I thought that being a Flight Instructor meant that you automatically had to be miserable at everything in life.
Once I left that training environment, things changed. I LOVED my instructing job - every second of it - and will even go out on a limb and say that I found it every bit as rewarding (if not more so) than 121 flying.
Keep the head down, and your nose to the grindstone - You'll make it just fine, and you'll Love the journey.