I like a girl, but am too scared to say anything how can I get the courage?

So, I met a couple girls about a month ago on campus(college) and we became friends pretty much instantly and soon I was confused how I felt about both of them I eventually realized I liked one of the girls(girl 1) but she is interested in someone else and I was really hurting so I confided in girl 2 about it(I am scared that was a mistake seeing the circumstances) and I eventually got over it and over the past few days after going to a concert with girl 1 and 2 I saw something in girl 2 that I hadn't seen before and after that I had a dream about her and have been thinking a lot about her my heart beats faster and it is hard to describe but that feeling you get when you are excited like a fluttering in my chest I am really close to just telling her or asking her out but I am still too scared how do I get that last burst of courage to finally tell her?