Girl, what do you think I should do? I think I'm hopeless.

You can continue to care about her, but don't interfere with her. Don't let her feel that your concern is a kind of interference, so she will get bored. Talk to her sometime and try to focus on why you care about her. It's best to hear something like "why do you care so much about me" from her mouth. Then you can explain to her. She will also give a certain response, don't be impatient, if she says "I just want to be friends with you" or something. You must stop, don't lose heart, you still have a chance. Don't say anything, just nod. Continue to care about her in the future. Until she accosted you. Don't show impatience when you speak.

You can think of the reason for doing this. I hope you can succeed.