I use to be shy too! My voice would tremble when I talk to girls. But I overcame that and you will too, eventually. It just takes practice. The first thing you can do when you meet people is introduce yourself and ask for their name. That is VERY easy and it CAN'T go wrong.
In fact, here is a monologue you can use to approach people.
You: Hi what's your name?
Girl: (she might not ask for your name)
You: I'm Puff the Magic Dragon
You: So.....(think of anything)
Girl: (answers 30% of a follow up question)
You: Um....(think of another thing)
Girl: (answers 40% of a follow up question)
You: Hey me too!
Wait 2 minutes