I (22M) have an online friend I’ve been talking to, “Ana”. (20F). Ana asked me out. I don’t know how to be a good boyfriend or what to say. I’m an anxious mess who’s been largely unnoticed by girls even in high school. Because of this, I said “Sorry, no,” even when I did want to be asked out. I cried about it because I felt bad but also because someone actually seemed to want me.

To add to this, even realizing your anxiety is a problem is a huge step. See a doctor and/or a therapist.
I struggled for a long time because I thought I was depressed when that was true, but I was depressed about the things my anxiety kept me from doing.
Knowing that anxiety is holding you back makes it clear that you’ll be much happier if you figure that out.