TS, don't look at it as a confession. It's part of a conversation between 2 person. If she does not like you as well, so be it.

Don't avoid her like she's a stranger. That's a sore loser's attitude. Each time you see her, give her a sincere smile and greet her. Then walk away. If it's her birthday, wish her. If it's Valentine's day, tell her you hope she enjoys her day. If she is a decent girl, she will reciprocate. Just don't assume she likes you if she reciprocate. If she doesn't, then she's not worth you being nice to in the first place.