Are we really friends? (Please, I need advice!)?

[Adalynn]

You can do two things.
1. Ignore her for a while and see if she misses you and sends you a message first. That will show that she cares and is really your friend

Or

2. Tell her about how you feel, she may not be rude about it and say that she doesn't mind, but ask her to be completely honest with you.

Watch her replies, if they're short and dull, then she is annoyed is like you said she spends hours talking to you then she cares and sees you as a friend. There is no way to tell for sure unless you try one of the above.

Goodluck!