I m 22 m and need a help regarding 21 f. Written whole sum and substance below

I don’t know why it is too difficult to understand girls . I met this girl first time in an education centre. I liked her but never had courage to do anything. But once I got a chance and she asked me for help. So I got reason to text her . It was just a casual chat . Sorry I forgot to tell that one guy also came there and she is good friend of him. They went to home altogether. So lets continue. So I help her for her need . And then tried to talk to her by asking was that help really helpful to her . And that day we had a good chat . I asked her too many things .She even enquired that am I writting biography of her. She also enquired about stalking and I said no. She asked about movies , songs and other things . And suggest to listen to song mujhe raat din from sangharsh movie . I m too fond of old songs though . When I listened to that song I thought maybe it some hint . And then I saw her noticing me , and I m very introvert so could not talk to her . Then one day we were discussing about movies only . Then I sent her meme , in which there was written that I could talk to her in chat only and in person I felt scared . So she replied that yess it is visible and enquired why it is ? Is she horrible and then i replied no maybe due to less interaction with girls from childhood only .All was going good with light banter . Then next day I texted her something and she saw it and didn’t reply for it . So that was awkward for me . So after that we met in class and she was in good mood and tried to tease me . So on that day first time i tried to talk to her in person , followed her but really stammer in front of her . Not able to talk a bit and she replied that text on WhatsApp and I asked was she angry by that last message so she replied yes . Then I text her but thought maybe I was tempting so much so I delete it for everyone. Next day I again tried to follow her and I just told her sorry for that last message but from next day she was in very bad mood . After 2-3 days I text her a long message because I thought maybe she was pissed off by me. And she replied yes she was angry as I followed her and scared too. Then I apologised her and she said it’s ok now all fine and let’s meet on Monday . But in Monday again I maintain distance to respect that boundaries. But on Wednesday we were sitting and she was just teasing me little bit . So I texted her again that is everything all right . She replied yes all is fine and said she became tired due to clg hectic schedule. Today also she talk to me in a very short conversation like just teasing . And then I told a dialogue of paatal lok in class and then I sent her that dialogue video only on WhatsApp but she saw it and don’t reply it . She never wait for me and go alone if that boy not come . She text in a very short manner. She told me that she has only one or two friend. I guess she is shy type . Even I don’t know exact . Yeah she also told me that her friend suggested her to block me for that case but she didnt . I m really confused what to do , what not to do. Is she shy or not able to express or she is disinterested. Kindly read this and guide me . Plz required any Female or experienced male for this . Females can better understand these type examples. Dm if you are seriously interested to help.