I told this girl in my class that I think shes really cute...what now?

I met this really cute girl in my bio (college) class about 3 weeks ago. We small talk everday and I try to flirt with her. I was about 70% sure she liked me so today I just talked to her and told her (despite intense nervousness) that i thought she was super cute. I was planning on asking her out (on a date) afterwards but I was not sure what to make of her reaction. After I told her she paused for maybe a second then she smiled and said thanks (it might just be me but I dont think she was TOO excited) then she said it must be her curly hair, i laughed and say maybe. After that she just continued to talk to me. I made a few jokes (dumb jokes) and she cracked up and smiled/made eye contact when I talked to her as usual. I dont know what to make of it though. I guess its good that she didnt completely turn me down but I was hoping she would tell me she thinks im cute too or something. its like shes not really trying to get any more of my attention but she certainly isnt trying to ignore me either. also shes generally very friendly so i dont want to misinterpret that for anything. anyway, after class i asked her what she got on her test and when she found out we got the same score, she high-fived me in a cheesy way. also she seemed really excited about watching my youtube guitar videos and when i told her had to cancel going skydiving last weekend, she got really excited about the idea and said she would of went. on our way out, i asked her how old she was and she kept teasing me telling me she was 28, then she said 15 (shes really 19). What should I do? Do I still have a chance here? I was initially discouraged and was planning on backing off but i'm not sure anymore now that i think about it. i mean its good that she still talk to me after i told her right? i figure if she wasn't interested, that she would try to avoid me or at least not encourage any flirty/friendly conversation. should i continue to pursue?? how? any advice or opinions are appreciated!