Well strength on SMG is only advised for full auto at 7. You could still get it if keep putting points there every 4 lvls until 24 (if you did not waste too many before) but it is going to take longer.
Full auto is still really recommended for AR, not so mandatory for shotgun build. You can perfectly keep the build, at 5 Str you unlock shottys and at 6 AR, 7 for more options. You can meet the wield requirements with food also, (+1 str) but you need the hard stat for the feat.
That way you can try more weapons if it is your first run, and decide later if you want to do a second run. Specially on normal since you do not need such an optimised char.
Or you can reroll now if you prefer, I'd you already passed depot A you won't have too much trouble doing it. A second time.