Im [18/m] and there is that girl [17/f] that makes my mind go nuts ( in both ways )

[aas]

First sorry if my english is not the best.Last year of Highschool. So about 3 months from now I saw a very good looking girl(17yo)that I got really intersted in her, everytime I was walking by her we both looked at each other with "that" look and I liked it. Now..I started talking to that girl something like 2 months from now,the converstions went good even some of tham went very good I didnt spammed her like crazy nor talked to her for a week. Sometimes it took her 5 mins to replay me some other times a few hours or even a day. I asked her if she remembers me from one time that we talked (for 1-2 min max) and she didnt. So at some point I sent her a msg and she didnt replays it untill now (two months after I sent her the msg), so obviouslly I thought she filters me. Once we came back from the summer vacation I saw her and she saws me and I didnt know what to said because I didnt know if I should say something and she just passed by me. Once again she is looking at me and im at her and I barley talked to her (just said:"her name whats up,already forgot me?" and she was like: " yea.."). She is my friend in Facebook, and everytime that I post something she likes it , iI mean every single thing ( not that I upload that much but yea..) And i just have that wierd feeling that she is actually likes me but shes to shy to say anything and I just fuc*ing dont know if I should say something,I tried asking my friends for some help but none of them helped me bigdeal and each day passing by I find myself thinking on her but I just cant think on one good way to get close to her. She is a very friendly girl that talks to everyone and yet.. I cant talk to her. I have that feeling that if I didnt talk to her in the summer vacation I could get way closer to her. Now im stuck. So I ask you guys for help since so many other did not.