Welcome Agent47 to the start of your new life!
I've never been with a girl in my life and this is my first time
Say goodbye to that soon. You will improve, really. Remember to respect women, don't lie to them (do not give false expectations, etc) and it will be a sweet ride for you and your lovers.
I would like to give my point of view in some things you've done with this girl.
I contacted her through Facebook and I asked for her phone number and she gave it to me.
This is wrong. I understand contacting someone through facebook if you don't have other way. In your case, this girl is in your class. Which do you think is more attractive? Please, pick a door:
• In door number one we see you talking to this girl, then, asking for her number.
• In door number two we see you seating in your laptop (surely looking at some of her pictures while getting the courage to text her) and sending her a message asking for her number (or maybe you chit chat a little before, it doesn't even matter)
If you picked door number one you are right. But, of course, you acted the way we see in door number two, which is totally understandable. Don't sweat it. Now you know.
I told her that I fly airplanes and she was really interested in flying with me.
I don't know in what context you told her this, but, just in case, be aware of showing to much value about yourself in an explicit manner. An example:
Her: "Well, I like to play pool"
You: "Cool! I love to surf!"
If you say things that are cool about yourself like these, they will feel as trying to impress ("I'm a cool guy!").
Rule: She should be the one talking. Try to avoid talking about yourself as much as you can. Being mysterious is sexy. Girls like to discover things. Just think of it like a PC game where you have a quest. Would you go online and read a walkthrough for every level? That would suck all the thrill of the game… It's kind of that for girls when they know a new guy (let them discover you).
I asked her one time to have a lunch with me after one class and she came with me. She invited me one time to her place and I found a lot of her friends with their boyfriends but non of them was single except her but I couldn't get time to talk to her because her friend were interested in knowing me because I'm from a different country.
Just in case you are beating yourself up against the wall after everything I've told you, remember that it doesn't necessarily mean that you fucked it up for doing those things (I would love to know her age because it's kinda of different when they are 16 than 21... you know?)
In this case, it sounds great that she had lunched with you and invited you home. Now… I'm betting (because you are very new with girls) you are coming as a nice guy for sure. Nice guys become boyfriend or friends material. And the risk of being labeled boyfriend material (we all know the problem about being a friend material) is that girls slow down with you, consequently, more risks of failure (due to the extended time of being with her without getting physical).
When you are in interaction with a girl you will have to start being a little more bad boy, mysterious, sexy… read the posts in this site and you will get a good idea of this things (of course! don't forget fundamentals: posture, walking, eye contact, fashion, etc) and practice a lot (theory won't do nothing if you dont approach girls).
Also, it's better to be on a date with a girl alone, not with friends. Next time some girl asks you to join her with her friends decline (politely, say whatever excuse). Then schedule a meeting were you are both alone.
I arranged for three flights to fly with her but I had to cancel all of them due to bad weather.
The first thing I would recommend (check this
post about dates) is to simplify your dates. Flying planes? I sounds great, but, you will both be to much in that exciting activity that the focus of her attention won't be you, it will be the thing you are doing. Not good. Grab a cup of coffee with her at startbucks or something like that.
That being sad, let's continue. You flake three times on her. Yep. When you told her you couldn't go flying due to the bad weather you should have told her to do other thing. Simple. You want to know her, right?
Since then, when I text her she doesn't replay to me and sometime she took one day or two to replay to me. Does it mean that she is not interested in me and I should move on? What should I do?
I guess you might have already fucked up. Besides the first things I have told you you should have done differently, I'm going to note two that I think are enough for me to think that:
• You've been a nice guy when you were with her
• You've cancelled three dates with her
I wouldn't like that if I was that girl.
I don't know how your conversations with her are going but I would stop texting her and just wait. Hopefully she will contact you. Then play a little hard to get and get her on a date. Then you should try to be everything I told you (bad bod, sexy, mysterious, set your expectations clear, etc).
Meanwhile, go out an start approaching lots of girls. There are too many. You don't need to get hung up on a girl. When you blow it with one and you have four more, it won't bother you at all, or at least, not as much.
Cheers!