Listen man, read the bible. You've done a lot wrong. I'll try not to go hard on you. Let me explain.
Number one, never give a girl a piece of paper asking if you want to go out or not. That's a very wussie thing to do. That fact that she hasn't reponded is not a good sign, she's probably scared to tell you that she doesn't feel that way. And that she doesn't want to ruin your friendship.
Number two, never give flowers to girl on valentines day unless you've been together than more than 4 or 5 months. Guys should never have to buy a girls approval. I know you weren't thinking like that but that's how comes off to girls y'know. She isn't even your girlfriend yet so, don't waste your money even if it is a nice thing to do. The reason is, is because it's a wussie thing to do, and your putting pressure on her to feel something she may not feel. Girls hate that. And it's a major turn-off. And your putting yourself in a extremely vulnerable position for her to hurt you. You definitely don't want that. You have put her in a very uncomfortable situation.
Number three, you say you kissed her a couple of times, we're you on a date when this happened? Or were you just hanging out with some friends or something and you two just started kissing? I mean, has she expressed any feelings for you? You two should have already been dating if you two were kissing of course. If you two have been going out then, you made a bad move by making the situation serious by asking her to be your girl. You should have kept going out with her because eventually that would have happened and she would think that. Never turn your relationship with a girl into a serious mode. Another thing girls hate because she's probably not ready mentally, I mean she's only fifteen.
That's another thing I want to say to you, you can't fall in love at the age of fifteen. Your so young yet. You should be out just having fun and going out with girls now to gain experiance (I don't mean sexually of course) then when you meet that special girl five or so years from now you will know how to act. And you will be able to sweep the girl of your dreams off her feet and marry her and live happily ever after or whatever.
The are no special words to use to make her go out with you and feel this instant attraction for you. Sorry, not possible. But there are ways of asking a girl out that could better your chances and get her thinking about you. Like for instance, I would say something ****y and funny like this to her: "How would like the HONOR of going out with me (smile)" Not the best example but that's the best I can do off the top of my head right now.
Okay, and finally (wow, I wrote a lot and still writing) what I would do If I were you is play it cool, and move on to other girls. YOU can ask her about the note but do you really want to hear her say those painful words of rejection?! Believe me, It will SUCK IF SHE SAYS NO! I know your situation first hand because I was once in a similar sounding one. I did the flowers and everything, but it wasn't on valentines day. You know whats funny, after that day I found this site a week or so later and changed my whole life around. If you MUST however, ask her about the note make sure you bust on her about it, something like this: "Do you know how to read, I gave you this crazy note and never got a response, well, since you can't read I'll just tell you. Go out with me, You'll have fun! " And if she says no, smile, and say "too, bad" And walk away. Don't ask her "Why?" That's the worst thing you can do.
If she says no, move on, flirt with other girls, date other girls. See what developes with them. If she decides she wants you in the end, GREAT!! If not, NEXT!!
And I would highly suggest you read the DJ Bible for highschool. Also get Sosuave.com's tip of the day newsletter. Read everything on that site. All the tips, everything. IT'S ALL VERY USEFUL INFORMATION AND LIFE CHANGING. Also subscribe to
http://www.doubleyourdating.com newsletter. I HIGHLY RECOMMEND IT! And remember, bro's before ho's.
Peace,
and good luck