<human>: Can you give me the gist of the text in a nutshell?

I (21 M) am an introverted and shy guy who has problems in having relationships. my problem is most of the time I liked girls whom they do not liked me or they are in relationships. I do not know why this happens and what is the problem. 
Now I like a friend (19 F) that we know each other for about six months and I want to have a relationship with her but I am not sure about her though about me and about her situation (single or in a relationdhip). sometimes I see positive signs about she likes me and some times negative signs. I don't know how and what should I say to her. 
Another problem is that I have a fear about getting "NO" response and it stops me from doing any ction.
<bot>: The shy guy (21 M) who has no idea about how and what to say to his friend (19 F have been friends for  about six months) about liking her. When he has no idea about her though about me.