I'm M17 and she is F16

The thing is that i am talking to a girl f16 and I don't know what to do like she gives me signal one day we talk to 3 in the morning, another day we just chat like once in a day its a type of on and off thing I do like to talk to her and shee too We haven't met in real life coz of some other stuff I don't find topics talking to her. But when we talk till 3 in the morning that's the only time I think that we are really close to each other,i do know that she's intrested but i dont know if thats her nature and she's been talking to other guyss too And one more thing I'm in the last year of my highschool,untill this girl came into my life I was really hardworking but as she came All my energy when into her and it's draining me when we are talking i feel a lot of joy but otheriwse i think i should work too Can you guys guide me on whatever is happening and give me ways to get her completely or some other advice I would really appreciate it thanks!