There is this cute looking girl who works at Macdonalds counter, I saw her 1 time before, I didn't talk to her because there was a lot of customer. And of course i was scared..... So I say to myself, next time Imma talk to her.

So today I decide to go buy something to eat at the Macdonalds and there she is again. This time the place was kind of dead, not a lot of customers around. She was the one who took my order, and after that, I wait for my food at the counter right beside her. She stood there, not doing much. But apparently I am sad and weak.... I just stood there and didn't talk to her as planned!!

I read a lot about Approach Anxiety, but it still doesn't help me over come it... I guess I just didnt know what to say in that situation.

Tomorrow, I will have a class with this fine looking japanese girl and another class with a cute Chinese girl. I am planning to talk to them tmr. Please give me advice on how to man up and actually talk to these girls. And for the girl at Macdonald. What should I say next time when I see her??

You go up to her and say hi. Don't even think about anything else. I have approach anxiety (bad) and whatever I think I'm going to tell her my mind just goes blank when I'm talking to her.
You go up say hi. Then you have nothing else to say ? Smile don't say anything. She'll wonder what do you want from her and she will ask. You say "I just wanted to tell you you are cute". Be completely honest.
You blush ? Blush who gives a shit. If you do this a couple of times you won't feel anxious anymore and you can just have a fun conversation.
Or you can come up with something really simple. I mean really simple.
Now I'm not saying that this is the most effective method to pick up women. But it's very good to beat approach anxiety.
Personally I think to overcome approach anxiety you need to actually act (ie. approach) when you feel it.
You will have tons of confidence once you learn to control this mate.
Good luck