Miserable seat situation

ATL-SLC sitting in row F and the 350lb guy in middle seat’s is 4-5 inches in my seat. His elbow (should be crossing his arms) is in my side and his whole body pushing me to turn sideways. Freaking hate this. The arm in the side is the worst.

He said it is a short flight so basically you have to embrace my size. And I am not a small person myself.