Mixed signals from a girl, Help!

SO I like this girl (call her J)

Dear all,

I apologise in advance for this essay

SO I like this girl (call her J) and I think she likes me back. We have being looking at each other for the last two months and saw some positive body language. She is a very shy person

She has a best female friend and they are always together since last year (currently year 2 at uni, call her friend M)

So yesterday I had my balls and talked to both of them in the student union with my friend they both smiled and acted nicely. Next, me and my friend had a lecture with J but not M. I have sat next to J in the lecture hall as she is used to sit alone in that lecture

We have talked for around 10 minutes about random stuff and where she's from etc and she smiled a lot

The next day -today- I came early to the lecture and sat next to my friends. When I was looking into my bag she came in, only when she was about to sit somewhere else I've noticed her staring at me, didn't smile as it was for only 3 seconds and I wanted know if it's her or not

She sat next to her M and they left early. The next lecture I had sat next to her.. gave me the cold shoulder and started to talk to her friend all the time before the lecture, I have asked them something and they smiled and gave me a short answer and continued talking

Am I screwed? Should I continue on to add her on Facebook or sit next to her in lectures or she is not interested?

Thanks

Just say something positive or ignore this thread, trolls

I would prefer if a girl answers this or a guy with experience

I am a guy with experience. You call someone a troll because they give you the answer you don't want to hear. You want someone to tell you you're right to mess about guessing signals for another two months until you're crying into your pillow because you aren't man enough to just go an ask her if she likes you back.

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That wasn't nice

It's true though. See it all too many times. Someone posts almost daily in Relationships seeking affirmation that their shy guy approach is going to work then get furious at people telling them it won't.

This is my first time posting here. No one will get furious at you if you don't insult them

That wasn't nice