I have two answers, and you probably won't like either. If I was you father (I'm old enough to be) I would want to believe that I taught my daughter good values, and self-respect, and she would NEVER EVER wear something like this, at 16!! As I guy, when under 18 girls wear something like that, I wonder what their parents are thinking, letting you wear something like that!! You are essentially ASKING guys to hit on you!! I think it looks trashy, and I think you have more self respect, for yourself, and you know you shouldn't wear that!!
I like them. I think that she likes the way she looks. She's positive about her body. So I like that part. Then comes the "Does it fit her?". And " Is it appropriate for her to wear it?". If "Yes" and "Yes" then it's all good. If "No" then I think negatively.
To be honest? Nothing. Sure, I find the women anatomy pleasing. But I can't be noticing what every female is wearing around me. And seeing a navel is not really enough to disturb me in any way. It can't be worse than a bikini after all
As a guy who finds an attractive girl's stomach and belly button very sexy, I love crop tops, even when they show just a little bit of navel. I'd be trying hard not to make you uncomfortable by gawking too much as I passed by but I'd be excitedly trying to get a really good look at your belly. I especially love it when girls seem to notice and enjoy my interest and smile to themself as we pass each other.