I actually just posted this on a near-identical thread:
"5in is fine. 3in is fine. 7in is fine.
Being responsive, sensitive, communicative, and invested in your partner's pleasure as much as your own is far more important than your anatomy."
Seriously. It's true. Some girls are size queens and like big penises; then again, there are also small penis fetish sites out there, so it's not a one way thing. No one is going to think you're abnormal with your pants down.
Also, penis size isn't correlated to height. Or hand size. Or foot size. It's all an urban myth.