Stop dicking around.

If you had just came out and stated your feelings without being all weird or abrupt you'd have been perfectly fine. Instead you waited until she found out and it became strange and somewhat awkward.

Now that you're actually going out with her you're too shy to even talk with her. If she's acting like she's ignoring you or is irritated with you it makes perfect sense. If you're too much of a pantywaist to even talk with her of course she's going to be somewhat put off!

I think what you're looking for is a way to get around this shyness of yours but you're not going to find one. You're just going to have to buck up and find the strength to just be able to approcah her and talk normally.

You want advice? Just talk with her. Don't act like she's different species, she's a person like everyone else and you have no real reason to be so nervous. With you being so self-conscious you're always going to find an excuse to not meet with her, you need to stop fixating on that and actually interact with her like a normal human being. It's this nonsense business of being shy and self-conscious that got you into this mess so talk to her now, not 1, 2, 3 or however many weeks from now.