Is she not interested? Should i just quit?

I have been talking to this girl for a few weeks now. When we first started talking she would always initiate the text but now she doesn't do it anymore. I usually have to initiate now. She does reply everytime though and fairly fast...

This is how our last conversation went

Me: Hey, I've been thinking...
Her: Sorry... been kinda out of it recently.. what's up?
Me: Nothing, are you alright
Her: I might fail a class and i'm scared asf
Me: Really? Which class
Her: Chem
Me: oh, well i'm sure you will pass just relax, you are really smart i see it in you
Her: I really hope you are right... Anyway what were you thinking about?
Me: Nah forget it, so wyd?
Her: No really say it... and i'm laying down.. i feel really sad
Me: I've been in your situation, its tough and even i felt sad about it at first but i kept moving forward, and about what i was thinking, i feel like this isn't the time to say it
Her: oh alright

I was thinking about telling her how i feel for her but idk i feel like i'm in the friend-zone so i didn't tell her because it might make things weird, am i in the friend-zone?

Also one time she called me "boo" and used a couple of emojis.. idk we have only been texting for a few weeks

We haven't even met in person yet but i'm positive that i like her. I just don't think she is interested idk