On your short walk and nice conversation, did you escalate at all? Did you hold her hand, or touch her at all?

Further, are you getting any actual IOIs from her, or are you just pursuing a girl with a boyfriend and seeing what you want to see?

Do you have her phone number? Do you see her frequently? How long have you known her?

More details needed in order to actually help you.

Never buy 2 tickets for anything before you've had sex with the girl in question.

Lesson learned.

Thank you for reply
"Your short walk and nice conversation, did you escalate at all? Did you hold her hand, or touch her at all?" - There was no physical contact, whole walk we talked just about "life" stuff. Holding doors for her is only physical interaction I could say.

"Further, are you getting any actual IOIs from her, or are you just pursuing a girl with a boyfriend and seeing what you want to see?" - I didnt understood meaning of this question (I am sorry), maybe you could say it in different words or style?

"Do you have her phone number? Do you see her frequently? How long have you known her?" - I do dont have her number, cause we mostly chat on Fb. I saw her everyday at school, now its holidays for me so I dont see her at all. I know her for "real" only about 3 weaks.

Oh dear.

IOI means indicator of interest. I was asking if you actually noticed any indication that she was interested in you... flirting, smiling, winking, playing with hair etc...

This was totally "friendly sounding", buddy. Seriously it just sounded like she went for a very platonic walk with you.

Yeah lol, my bad I said that I have, I didnt bought those yet

It's always a challenge to how to help a guy who doesn't understand that there is this thing
called ATTRACTION, let alone how it works.

But let me give it a shot.

When you are with her, don't talk only about serious stuff. Don't have just a conversation about
life and other stuff.

When you are talking with her, and you guys are talking about life and stuff, CHEER up and say something
that isn't that serious.

If you're talking about life and school, say something like, "Yea life is hard. It would be even harder
if I wasn't as handsome as I am..."

Lighten up the conversation and have some FUN in it.

Understand that women aren't attracted to guys who are too serious and can't have fun with them.
They want a guy who can be fun and not always as serious.

So invite her to the opera, but say something like, "I have these two tickets for the opera, I want to
invite you to go with me, but you gotta promisse that you won't embarass me by falling asleep while
they're singing..."

Or something along those lines.

And by the way, if you feel fear about talking to women or approaching them, I want to invite you
to participate in my test group, where I need 30 guys to test a new Approach Anxiety Cure technique.

You can join by clicking the link in the description.

And by the way, if she has a crush - so what? Girls have a crush all the time. Play your magic
with being there, talking to her and having fun - and she might develop a crush for you.

Good luck!