Imagine and think of these things I am about to lay out for you and think about and imagine them over and over again during the minutes, hours, days and weeks or really however long it takes for your body to catch up with your mind which I'm sure already agrees with what I'm going to tell you so anyway here goes...
1. If you don't make a move on her eventually someone else will and if you don't act soon enough to make that girl yours she will rightfully move on to the guy that is indicating interest in her while you sit on your hands and wait for some random moment of inspiration to become courageous that will never come. You must understand that being courageous is an action that you create for yourself just like how a samurai in an oldschool war would decide to be courageous and defend his ideals or honor. Courage like confidence is created from moment to moment via our decisions not randomly handed down via a feeling where we don't know where it came from. If there is any motivation for either of these things it usually comes from strong emotion. So do you feel a strong emotion that you should have a certain girl over someone else because she likes you? Well if so use that emotion to be courageous and push through whatever is stopping you. Let your love for yourself and what you believe you deserve to have conquor your fear.
2. So you say you don't know what to say when you are with the girl?
The Carthaginian military commander Hannibal once said "We will find a way or make one" which seems pretty obvious to me that perhaps you haven't thought of all your options. So you are a sh!tty speaker? A lot of people are and it doesn't help that you're trying to bring a shy girl out of her shell with your p!ss poor speaking skills I get it. So why not do what you are presumably good at which would be take her on some kind of action date be it bowling a walk in the park a trip to an amusement park or bungee jumping but yeah find something in this realm to do which both compensates for your weaknesses while allowing both you and the girl to have a fun time while getting more aquainted with eachother.
Another thing to consider whereas you could disregard the previous advice in this section is maybe the girl has been in her shell so much being so shy that she is afraid of talking for fear of saying something stupid and fvcking up her chances with you in which case you don't really have to worry about being all that entertaining as she probably likes you enough anyway to just hear you speak about random bullsh!t to admire how cute you look or whatever the fvck happens to your face when you say certain words in certain ways. Shy b!tches can be like that bro and you just have to roll with it if you want to get involved with them. Obviously the best indicator as to whatever you are saying is working is if the chick continues to remain in your presence and seemingly entranced by you so chill out and just keep on talking and don't fear you are doing bad or anything unless she starts to fall asleep or roll her eyes or something.
3. Imagine you think and stress about this chick for months wracked with fear about screwing up, not knowing what to do, not knowing how to move forward with her and then you finally make up your mind and get clear to do something make an approach whatever the next day that you see her but you get a phone call from a friend of her's or the place that she worked etc that she'd just been killed in a freak accident like a train hit her or something when she was crossing or just collapsed with a brain anerysm dead before her time (which actually happened to a cool young guy math teacher I had in highschool and happens to a disturbingly high amount of young people randomly).
Alright I'm going to get to the point at the end of this section but yeah you've just imagined the other part of section three so now imagine this. Its the same story leading up to you deciding to be courageous because your emotion finally motivated you to action and you decide to go see her the next day and make your move but on the way there you get into a car accident and end up paralyzed from either the neck or waist down for life.
The point?
Either of these scenarios could happen at anytime and with either one you'll be left asking yourself the age old painful question "What if?"
"How much more happiness and joy could I of got out of life if I could've just decided SOONER that my love and my courage and what I felt I deserved out of life were stronger than my fear?"
So it all boils down to this...
Will you seize the moment or will you risk living a life of regret and quiet desperation?
Or if you'd like me to put it in more hilarious and inspiring terms I'll quote the movie Full Metal Jacket to close out this post...
"Why don't you jump on the team (in this case DJ) and come in for the big win?"