Most Helpful Guy
5'9" isn't so crazy. I once was with a girl who was like 6'3" maybe 6'4". That was a little intense. You? You're maybe average, maybe a couple inches taller than average. No big deal. What, your average guy is roughly 6' in height? It's not like you'd be towering over them. It's not like you'd be particularly intimidating to any guy. I don't see how what you've got is too tall.
Anyway I imagine being really tall might intimidate some guys, or at bare minimum require a little adjustment, but with your height, you don't have a lot to worry about. Some guys have their own standard, but if any guy blows you, overlooks you, writes you off, or dumps you in any way because of something as stupid and trivial as your height, you are WAY better off without a shallow creep like that anyway.
Point is; Don't worry about it.
Good luck out there.