Hey guys i need some advice?

hey guys hows it goin. so today is my birthday and i just turned 19 woo hoo! lol. anyways yesterday i took 2 of my friends and their 1 friend from work out to disney. my one friend has been wanting me and her to meet for a while now because he thinks we could have a connection. she is a really nice and sweet girl. at disney we didnt really talk that much because i just have no clue what to say and how to talk to someone. ive never had a girlfriend or any of that other fun stuff that comes with that. also these two friends are pretty much the only friends i have ever had so i really dont know how to really talk to someone. i have always coasted through just by myself and never really talked unless i had to. im really getting tired of being a nobody. all through out high school i was invisible to everyone and so far in college its going the same way. i want to know how can i break out of my shell and start to be somebody. also how can i talk to this girl? im kind of into her and i dont want to not talk to her. i know that alot of you guys are going to tell me to just say something but its really not that easy for me. i tell myself that i am going to do something this time but then i just go right back into that shell. how can i force myself to do this? thanks everyone.