You admit that you have tilt and BR management issues, and that you aren't particularly skilled at Sit 'n Gos. MTTs are not for you. You will have to play a ton for variance to even out and your real win-rate to become apparent. I suspect that you would grow impatient and play out of your roll before that ever happened. And even if you made a few final tables, you wouldn't be well equipped to handle them, so what's the point?

You aren't really rolled for 100nl. Give 50nl a shot.