Hello, I'm a 15-year-old guy. I'm not really experienced with girls, I've girls as friends but not a gf. I like a girl who is in the same class that I go, I'm not sure if she likes me though. We've been in the same class for 3 years now, but I got to know her in the last months. We're talking to each other sometimes, but I've noticed that I usually start the conversation, i think she sometimes looks at me and smiles. She also talks quite much with some other guys and spends time with them. She has the sweet and cute personality, she giggles and smiles. So I'm not sure if shes just nice.
For example today I was hanging out with some girls+my crush and one boy from my class. When we had lain on the grass for about a hour the boy from my class said that he could go to shop and buy some food to us. He asked someone to come with him and my crush said that she can come. When we left with a bush to go home I left at the same stop as my crush did. I asked her as semi-joke - semi-serious that if she'd come to a shop with me next to bus stop. She said: no, sorry, i'll go home.
I'm not sure if she considers me only as a friend. Our school will end in two weeks and then we'll go to separate high schools, so I'm thinking about asking her out. Do I have chances?