Got them yesterday and they look like some child's toy

Mildly concerned but I'm pretty sure I'll love them and adapt fast. Always wanted to ride 38s, just erred on the side of caution. I have broad shoulders, so any guide or common wisdom you come across suggests 42 to 44cm for me.
Screw that though, why let the lemmings dictate biomechanics. Many of us can adapt to a wide range very quickly.
I'm more wondering if they'll make the bike twitchier.