Okay so after seeing a lot about direct game lately I was wondering how to handle girls that you haven't approached previously but would like to, especially in recurring situations like class/work/whatever.

For example, I'm currently working on getting over fairly severe AA and have started my third semester of classes at uni a few weeks ago.

I have 3 two hour classes a week with several cute girls I'd like to approach but in all 3 it's pretty much impossible to talk during the class (all of them are fairly active full class discussions the whole time).

I've either not yet worked up the balls to approach afterwards or I've had to talk to the lecturer and the opportunity disappears.

I'm headed into one of these classes tomorrow and I'm going to force myself to approach one of the girls afterwards. It'll be the 4th week I've gone to this class and the last 3 I've participated in the discussion and talked to one of the guys in the class but haven't directly talked to any of the girls.

While that might be a little specific my general question is whether or not to address the fact that I've not approached sooner or just act like it didn't happen?

Also suggestions welcome, there's probably some things I haven't thought of.