No, you won't get mocked but rather prove to be a magnetic sex machine.
On the 'dating' front, maybe it won't be so easy, from personal experience i didn't like having braces but the result at the end, justifies the experience of wearing them. If i'm being honest, kissing a girl with braces isn't that much of a turn on, rather a turn-off, so you may have to contend with that (for you, that'd be kissing a bloke or maybe not....)....i've never actually kissed a girl wearing braces but i can envisage it in my mind, catching my tongue or whatever etc...lets not get crude here anyway.
But you won't get mocked, and if you do, the people mocking are the losers, completely pathetic. People seriously do not take notice of whether or not you do have braces, my friends had forgotten, and like someone else mentioned, people aren't in the habit (thank goodness) for penetrating their sight endlessly on your mouth region.