How do I act around a girl that knows I like her?

I'm a guy and this girl I know knows I like her, very much. I'm already trying to move on (2 months since she found out)but the feelings still there. I'm trying to be friends with her, but she feels awkward when I talk to her. I only really make small talk with her when I see her alone and I am very polite and chivralistic so it can be misunderstood as flirting. I've told her I'm not but she still seems to avoid me more than as a friend and treat me as an aquntince. I confronted her, asking if I'm annoying/creepy and she finally said yes, even though I've asked this halve a dozen times in the past 2 weeks. I've left her alone and haven't talked to her in a week. I see her in classes yet I try to ignore her and not even look her way. What's my next move?