Yes, it's definitely not too late.
I'm not in a rush to get the girl, I'm being pretty chill about it.
As for being a lady-killer, I was thinking the exact same thing, but I'm just rarely flirtatious with someone I don't like. I just have normal conversations. However, I do know that she's aware I have many female acquaintances.
Last term she'd often pass through hallways and it'd be me being surrounded by women and having a great time conversing, they're all engaged or dating, but she doesn't have to know that!
I don't know, I just need to grow a pair and go up to her when she's alone, or when she's with friends I'm used with. After the initial 'hi!' I'll be fine.
Thanks for the advice though.