I'm a 15 year old guy and I like a 16 (or just 17) year old girl. She's a very flirty popular and hot girl and i know her from a school trip last year. I'm quite popular and quite attractive but no way near her. I didn't really speak to her after that schooltrip(3 day trip to Berlin) This year (2-3 months later) we've both stayed down a year and are in the same class. WE haven't really spoken very much yet. just short conversations. in one class, we were one opposite sides of the class with about 15 meters between us, but I looked at her at one point and she looked back and smiled at me. the next class, she was sitting next to another guy and i was on the other side of the isle (the class is rows of 2 tables and then a gap and another row) so there was about 50 cm to a meter between us. the other guy had to go to the front of the class for being loud or something. She then asked to borrow my pen. about 5 minutes after that i looked at her for about 2-3 seconds and then looked away, immediatly I saw her from the corner of my eyes turn her head my way she looked for about 2 seconds too and then looked forward again i then looked at her again and then looked away. she then looked my way again and looked away. Knowing that we both had seen each other I looked her way again but this time didn't look away and she looked at me and our eyes met, and we both smiled at each other in a kind of laughing manner. this all happened in about 15 seconds. At the end of the lesson(about 5 minuters after that) she gave me my pen back but instead of letting go, she held on to it and said thanks for borrowing it, but really exaggerated and smiled at me again, i then kind of shook the pen loose playfully.

that was yesterday. the day before i was sitting next another guy in the cantine, and she sat down opposite us. I was sowing the guy something on my phone and she wanted to see too so she sat down next to me to watch and leaned in and pressed her boobs into my side with her full weight for about 30seconds to a minute

Do you think she's interested or just flirting friendly, or not even flirting?

you have to keep in mind that she's a very flirty girl, and also a bit slutty(in her behaviour, not actually sleeping around)

seems like she flirting with you, but as you mention she a flirty girl so thats only natural for her to be flirty. Party of being flirty is being friendly being flirty and non-friendly is on a rare occasion. Start flirting back with her and see her responds. Is she gonna reciporate and flirt back or is she gonna change that. What are your intentions with the girl?

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"Live life to the fullest, never look back, remember No regrets" J.f

That's not a good mentality to go in with. The whole "she's out of my league" idea is all in the head. I'm not getting on you for it in any way, I just think that leagues are excuses to not go for a girl. You can talk yourself out of things before anything even happens that way.
Sounds like she is flirting to me. I'd flirt back and see what happens. Next time you have class, pat the seat next to you, smile, and say "Sit". More than likely she will, and then you can do your thing.

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"Vincit Qui Se Vincit"

why are you asking what her intentions are?

be a man and dive in. take a chance.

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Every Saint has a Past, Every Sinner has a Future