All this talk means very little.
There is no good SHTF gun that you aren't super-familiar with right now. Don't buy into "too much recoil" for a body size. Get a rifle you can drive nails with. Get a rifle you can shoot. Get Ammo. Lots of Ammo. Buy and stock surpluses of .223, 30-06, .308, .45, 10mm, and 9mm ammo to barter with.
Have a bug-out location but plan on becoming a nomad. If you can't walk well, ensure you have a horse. If you can't board a horse, ensure you have an ATV and thousands of gallons of gas for it. If you cannot grow and guard a food source your house/homestead is worthless. Your house will not protect you from more than about 2 bad guys with guns. 5.56 and 7.62 will easily penetrate household walls.
“… the greatest detractor from high performance is fear: fear that you are not prepared, fear that you are in over your head, fear that you are not worthy, and ultimately, fear of failure. If you can eliminate that fear—not through arrogance or just wishing difficulties away, but through hard work and preparation—you will put yourself in an incredibly powerful position to take on the challenges you face" - Pete Carroll.