Hi,
here is my situation. There is a girl in my class which i think she is interested in me, not sure. During class i always catch her looking at me. I look at her and many times I take my eyes apart, its a reflex. Im trying not to do it anymore and a few times i've looked back and smiled directly at her. At this point she blushes and takes her eyes away or looks at me back in a very good way (i dont know the word to use, lets say she looks back with a very sexy look)
Also i talked to her a few times, not for long (i run out of things to talk about), the good thing is that when i run out of things to stay she comes up with something.

Today we were walking together and got to her house that was near class and she left too easily, i was hoping we could talk a bit before she got in, as finally we started things to flow.
The problem is that our subjects are a more serious, not funny. I neg her very delicately and it didnt go well or bad, just the same, as if i hadnt said anything

Im not really interested in this girl, im just gaming her to gain practise but i feel she might be playing with me...
Shall i show more interest or less, next step?
thanks!

This is cool bro, i like how you're testing out this stuff, i've been doing the same.

Here's my opinion, it sounds like you've interested her obviously if you're carrying on conversations and what not, but its the content that worries me. What i'm noticing is that gaming is a very good way to end up with friends if you don't go for a close. Which is great if you want friends, but a little disappointing if you're looking to hook up. Truthfully this is a sticking point of mine as well, and the only thing i can think to do is to escalate the situation into something more conducive, and then make a move.
Sooner rather than later, and here's why...
The longer you talk to this girl, the more time you spend with her, the deeper into the friend zone you end up. Now the thing about the friend zone is it works both ways. So not only will you feel like she's uninterested, but you'll begin to feel more internal pressure not to mess things up with your new female buddy. I'm starting to think the friend zone is more of a thing guys put themselves into when they raise rapport and build anxiety.

Thanks for the advice, i really approciate it.
The good thing about this girl is that if it goes wrong i seriously dont care. Im attracted by they way she looks at me, and she is very very sexy but she is far from being HB8 for example, lets leave it in a 6-7 for my taste, my friends think she at least an 8 but i always have higher standards.
The problem with this is that i feel i already mest things up, because she just left, we could have been a couple of minutes talking but she just went...
It is also true that when i talk to a really pretty girl who i like, my conversations are much more funny, its just in me, when i see a girl i like i even may be too funny...
For that reason im practising with this girl.
Also, sometimes im a bit cold with her, i just say hi and do something else and i dont look at her, mainly because im focused on another thing.

This is calibrating ya know... Trying to work out your technique. In my case i'm going through mine piece by piece. Working through approaching, opening, and demonstrating higher value. Thats pretty much what i've gotten through so far, and i'm starting to exercise some NLP techniques. if you truly don't care if this girl is friends with you after this, calibrate further, see if you can pump her buying temp, and make a move. if its not too late you'll know for the future that for you, you can bring a girl to the brink of friend zone, and pull it up. if you fail, figure out why, and game on.

Good luck dude.