These threads make me laugh. I wouldn't give a single thought as to whether a physique would dictate jet choices. Hell, I think I was only 165lbs when I graduated college, 6'1.5".

3 things affect g-tolerance, at least in my viper career this is what i have noticed.
1. Are you hydrated?
2. Did you get enough sleep prior to that 0600 mass brief or were you up late boning the wife...or better yet, the mistress?
3. Did you start the strain prior to the break turn...or 2 seconds into it once the gray starts to set in? LOL. c'mon gents, don't lie and say the former.

You'll be fine dude.