Hello, not sure if this type of post belongs here but...

I'm 14, in high school, freshmen year. I like this girl, sometimes I get vibes that she likes me, I'll even feel some flirting. Other times, feels like she doesn't want to talk to me and just ignores me. I've been rejected by her before, but a few months after the rejection she started talking to me and sent me a few snap chats, I know the basics. Eye contact, strong mindset and confidence, posture, etc. I was just wondering if anyone had some advice. Any tips would be greatly appreciated