And this is the issue. For all people talk about playing unlikely heroes in D&D or ordinary people they are all D&D PCs. By having a visible physical disadvantage (and one without the known magical might of gnomes) halflings are as close as you get to the appearance being overmatched in D&D without fairly serious reskinning (Lazy Warlord style).
Huh? Halflings work just fine as PCs in my experience. Unless of course you're just saying that you don't want to play a PC that's short.