Help with a girl QUICK ANSWER PLEASE?

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Hello, im a freshman in high school never had a gf but i have had girls like me but i didn't feel the same way. I liked a girl in the fall and i was going to ask her to homecoming, BUT i made a stupid mistake and told a guy in my cooking class and told him i was going to ask her on Sunday. Saturday night i check my instagram and he had asked her after he told me he was going to ask another girl. I'm very nice too, so i didn't get mad at him. Then i quickly got over her. Soon there was another girl and she was gorgeous and nice and perfect. She liked me and again i made another mistake and lost contact with her for awhile. I told the same "friend" about the situation and i just got a snapchat from the girl and the guy was in it. And the girls friends say they have a thing but they aren't officially going out. I'm just wondering if i should tell her how i feel and what i should say? And how to win her back and not be awkward talking to her? Thank you in advance for taking the time to read this.