AfterBurn

Before I post my problem I already know that I'm a huge dork. Here goes.

Some girl really likes/d me in one of my classes but i never really bothered to approach her or anything and pretty much ignored her but she continued to give me signals. Then I somehow started liking her but didn't know how to approach her because I didn't see any opportunity to talk to her and from previous experiences I learned that just coming up and talking to a girl about something doesn't work too great. After some time I'm pretty sure she started hating me or something because she avoided me and I try and ignore her but I still sometimes notice her looking at me but I never return the eye contact. So now I have no clue whether she likes me or not or if I should even bother ever approaching her. Another this is when I see her walking and she notices me she always looks down and walks slower for some reason. I also noticed that she's not shy because she talks to guys all the time (there is over 100 people in my class). Anyone have any idea how I should interpret this situation?

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smoking weed everyday keeps the doctor away